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10-10-2009, 08:50 PM
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#1 |
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Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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truck runs when I turn the key off -
I just replaced the tumblers 6 months ago, but this afternoon I tried to turn the key of and it kept running. is the switch bad, or is it possible I lost a ground, because I am in the process of taking my bed out? I'm not crazy about having to disconnect the battery to turn the truck off every time.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD  Click here to support the board Philippians 4: 6-7 |
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10-10-2009, 09:29 PM
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#2 |
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Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: truck runs when I turn the key off -
I just took the ground side of the battery off and it kept running. I've never done that before (there was no reason too) but does anyone know if that's normal?
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7 |
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10-10-2009, 09:38 PM
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#3 |
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The Older Generation
   
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,651
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Re: truck runs when I turn the key off -
The switch could be bad or it could be a short. I don't think it has anything to do with the bed. Does it have an HEI distributor?
It's probably running off of the Alt. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 10-10-2009 at 09:39 PM. |
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10-10-2009, 10:13 PM
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#4 |
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Car Knocker
Join Date: May 2001
Location: jefferson,arkansas
Posts: 664
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Re: truck runs when I turn the key off -
I had a 71 burb, and I know this sounds crazy. Would keep running with the key off if the radio was turned off. Turn the radio on and the key off, engine would die. Never did figure that one out.
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68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit. |
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10-10-2009, 10:23 PM
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#5 |
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Registered User
Join Date: Aug 2007
Location: West Hills, California
Posts: 679
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Re: truck runs when I turn the key off -
My truck and cars did that also after installing msd boxes. There is a diode you can install in the alt wiring so it stops backfeeding voltage.
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10-10-2009, 11:17 PM
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#6 |
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Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: truck runs when I turn the key off -
It does have a HEI, but it's been on the truck for over a year with no problems until today. I think I'll start at replacing the switch.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7 |
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10-10-2009, 11:38 PM
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#7 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: truck runs when I turn the key off -
do you have an electric fan by chance?
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10-11-2009, 02:37 AM
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#8 |
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Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: truck runs when I turn the key off -
No electric fan. I tapped the switch a couple of times, thinking maybe something stuck, but nothing. I do have an amp and radio installed but it has worked fine for maybe 3 or 4 months with it until now.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7 |
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10-11-2009, 05:27 AM
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#9 |
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Rottenwood Garage Member
Join Date: May 2005
Location: Marietta, Georgia
Posts: 4,321
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Re: truck runs when I turn the key off -
Unhook the wiring hartness from the key switch and see if its still running.
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2004 Chevrolet Suburban C1500 2001 Chevrolet 2500HD Crew 6.0 1999 Harley Davidson Electra Glide 1972 Chevrolet C-20 Custom Camper "Dump Truck" 1972 Chevrolet C-20 Suburban "Big Green" 1969 Chevrolet C-50 Wedge Hauler "Leonidis" 1966 C-10 2x4 short fleet 327 4 speed "Race Truck" 1952 Plymouth Cranbrook "Rican" (my grandfathers) 1931 Ford Model A Coupe "Black Beauty" 1930 Ford Model A truck "Club Cab" 4x4 Rottenwood Garage and Speed Shop.....where everything must be racy! It's not just a hobby..It's a LIFESTYLE!!! Thanks for nothing Barrett-Jackson You cant fix stupid or teach accountability! Time wasters, looky Lous and tire kickers are everywhere! |
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10-11-2009, 06:22 AM
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#10 | |
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Registered User
Join Date: Oct 2009
Location: abbotsford BC Canada
Posts: 3
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Re: truck runs when I turn the key off -
Quote:
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67 lwb 1/2 ton - "christine" the parts hauler 86 k5 blazer - "The Beast" 6" lift on 37's 88 toy/let project going on 44"s 08 sterling bullet lwb tow truck |
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10-11-2009, 08:00 AM
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#11 |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,651
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Re: truck runs when I turn the key off -
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After reading through this again I think Pont406 might be on to something. Try unhooking the wiring to the alternator, start it up and see if it will shut off. Make sure the alt. wires aren't touching anything metal. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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10-11-2009, 08:22 AM
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#12 |
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The oddest Todd around
Join Date: May 2004
Location: Miami, Florida
Posts: 1,418
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Re: truck runs when I turn the key off -
It's just how great these trucks are. Nothing can kill them. They run no matter what... Even when you try to kill them, they keep running... You can't even turn these bad boys off.
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"The greatest pleasure is to vanquish your enemies and chase them before you, to rob them of their wealth and see those dear to them bathed in tears, to ride their horses and clasp to your bosom their wives and daughters." Ghengis Khan IIOY??? Last edited by toddtheodd; 10-11-2009 at 08:22 AM. |
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10-11-2009, 09:27 AM
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#13 | |
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Registered User
Join Date: Sep 2007
Location: Tampa,Fl
Posts: 82
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Re: truck runs when I turn the key off -
Quote:
funny chit
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10-15-2009, 11:24 PM
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#14 |
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Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: truck runs when I turn the key off -
O.K. - I pulled the alternator wire off, and tried to turn off the truck - no dice. I have now replaced the ignition switch with a new one from Brother's, and it still doesn't shut off. Does anyone have any good ideas??
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7 |
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10-15-2009, 11:43 PM
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#15 |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,651
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Re: truck runs when I turn the key off -
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Is there only one wire that plugs into the HEI? Where does the hot wire to the HEI come from? Unplug the hot wire from the Distributor and see if it is hot with the key off. If it is you have it hooked to the wrong source. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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10-16-2009, 12:05 AM
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#16 |
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What?
Join Date: Jun 2007
Location: Southern California
Posts: 7,617
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Re: truck runs when I turn the key off -
I'm real interested to see the culprit to this gremlin.
Since years ago, before I began restoring my burb I had the same thing happen to me. Just so happens I was stuck up there in your neck of the woods! Luckily I was up at my Mom's house, and I had a local Napa store near by. The only way I could get mine to stop running was to through a rag on top of the carb to choke out! I had disco'd everything as well, and it would just keep running. There was a bigger problem though. In my case I could not get the truck to go above 3K RPM under load, if I did it would sputter and backfire... Long story short, I ended up going home with a borrowed car. Once there I grabbed a engine I had, and trucked it up there. Had the local Chevron swap out the motors, then drove it home! Took my 327 to the shop for a diagnosis, and apparently all of the rings washed out. Half were broken, and the others were pollished and the edges rounded off. I would have never believed it, but the machinist showed it all to me. He said that I must have over heated or leaned it out? It was a hot day, and I did hot dog it up highway 101 up the steep grades but I know I didn't overheat... One of my all time mystery's I have had in my burbs past.
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Chris 1968 K20 Suburban 1972 K10 LWB PU Last edited by vectorit; 10-16-2009 at 12:06 AM. |
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10-16-2009, 12:18 AM
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#17 | |
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Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: truck runs when I turn the key off -
Quote:
__________________
'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7 |
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10-16-2009, 12:43 AM
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#18 |
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Registered User
Join Date: Oct 2009
Location: coupeville ,washington
Posts: 348
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Re: truck runs when I turn the key off -
Mine did that when there was a problem with the alternator wiring. I would try another new switch, i had a hard time with my wipers last year becuase i got a bad switch from brothers. I replaced the switch then the motor and then found out my new switch was bad.
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10-16-2009, 01:35 AM
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#19 | |
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Registered User
Join Date: Dec 2008
Location: Yay Area CA
Posts: 2,329
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Re: truck runs when I turn the key off -
I would go with locdocs recomendation to test with key off engine off if there is power at the batt terminal on the hei (If there is no power it suggests feed back on the alternator wiring brown wire) If there is power with koeo it a wiring or switch issue.
Do you have external or internal voltage reg?
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1965 GMC shortwide big window 1969 Chevy C20 long (for now) 2005 Silverado 2500HD Crew Cab Quote:
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10-16-2009, 09:37 AM
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#20 |
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Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: truck runs when I turn the key off -
Internal. 1 wire alternator. It's actually the second switch I got from Brother's - the first I couldn't even get the tumbler installed into. This one had a big chunk of plastic on the bottom of it I had to fish out before I could install it.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7 |
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10-16-2009, 10:02 AM
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#21 |
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Registered User
Join Date: Feb 2009
Location: OKC OK
Posts: 489
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Re: truck runs when I turn the key off -
 I'd be a little more concerned if it starts itself up, remember Christine?
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"You can put lipstick on a pig, sure it's pretty pig, but it's still just a PIG...  71  LWB
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10-16-2009, 10:24 AM
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#22 | |
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Senior Member
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,956
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Re: truck runs when I turn the key off -
Quote:
I guess I'm old. Back to the original question. Apparently you didn't change anything that might have caused the problem, so that means something either wore out or broke. You've tried the key switch and the alternator, so the only other thing I can think of is the starter solenoid. Your solenoid has two small posts marked "S" and "R". The starter switch should be connected to the "S" post. The original coil may have been connected to the "R" post. If the HEI is connected to that post, carbon arcing may be causing it to short and provide juice to the HEI even with the ignition switch off. Kind of a long shot, but it's the only thing I can think of that you haven't tried. |
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10-16-2009, 10:34 AM
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#23 |
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Registered User
Join Date: Oct 2008
Location: Perry OK
Posts: 121
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Re: truck runs when I turn the key off -
I had this very same problem on my truck soon after I got it. I first changed the ignition switch as it had one burnt terminal, but no luck. Two days before this happened I had made the one wire altenator swap and had crossed some wires on the voltage regulator, no problems since I corrected those wires.
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10-16-2009, 12:47 PM
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#24 |
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Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: truck runs when I turn the key off -
Truckster, thank you - I'll try that and see if it works. Whatever the problem is , I'll find it, and let you guys know for future reference.
__________________
'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7 |
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