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#1 |
Registered User
Join Date: Dec 2004
Location: Saskatchewan, Canada
Posts: 1,371
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Turn Key off, truck runs...
Well, I think I'm nearing the end of my Painless harness problems. My newest thing is that when I shut the truck off with the key, it continues running until I pull the power wire off the coil on the HEI. Is there a simple explanation for this, because I can't figure it out, as the ignition cylinder just plugged right into the harness. Thanks!
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1964 Chevy Short Fleet: Tornado 1972 Chevy C10: Fast Orange Secondaries Wide Open |
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#2 |
Truckin' Krazy
![]() Join Date: May 2000
Location: mesa az
Posts: 6,193
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Re: Turn Key off, truck runs...
Sounds like you bypassed your ignition switch & just have straight power to your hei. Make sure the wire running to your HEI out of the fuse box goes dead with the Ignition switch off, If not find one that does.
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Dealer for: American Auto Wire Precision weatherstripping Dakota Digital Trim parts Carpets Truck World seat covers & Many others Chevy Parts locator in Mesa AZ! Last edited by t korinek; 12-02-2007 at 01:09 AM. Reason: More info |
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#3 |
Registered User
Join Date: Apr 2005
Location: Monroe, WA
Posts: 298
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Re: Turn Key off, truck runs...
Check painless's website forum. I believe that you need to put a diode #276-1661 from radio shack on the one of the wires to the alternator. I think it was the white alternator exciter wire, but I would check the website. This diode is like a one way valve to prevent the alternator backfeeding voltage to the rest of the system. Easy crimp/crimp and my problems were solved. They should put the information into the installation manual.
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67 K10, lwb, fleetside, 327, 4spd, 205, cab and 3/4 frame swap, 14 bolt, big window, and a "rustoleum roll job" |
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#4 |
Registered User
Join Date: Aug 2007
Location: pittsburgh pa
Posts: 1,970
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Re: Turn Key off, truck runs...
I HATE PAIN-IN-THE-A$$ WIRING HARNESSES!!!! I bought their tune port harness for my 68 and could not make it run... I went through wire by wire only to find they had three wires swaped in various connectors throughout...
I cut it up in chunks and sent it back to them.... Bought Street and performances harness and everything was great!! Ok I'm off my soapbox now! ![]()
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68 C10 Shorty TPI,Bagged, and all the good stuff. Classic trucks feature June 06, On the cover of Jegs Christmas Catalog 08 67 C10 Shorty Shop truck project Bagged and Z'd under destruction and getting nowhere fast. 64 C10 Shop Truck/Daily driver, Bagged, Dropmember, SOLD!!!! Gone but not forgotten.. 54 GMC under the knife getting a S10 chassis swap and bagged. See my build thread... 07 GMC Sierra 5/7 drop, 22's and 24's Air ride on my mind.. http://67-72chevytrucks.com/vboard/s...d.php?t=339340 See pics of my trucks in my profile |
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#5 |
It's a catastrophic success.
![]() Join Date: Jan 2003
Location: Oklahoma
Posts: 2,077
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Re: Turn Key off, truck runs...
Hooking to the wrong terminals on the solenoid or not using a "ALT" light on the charging sys and using an electric fan without a relay can cause this problem.
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#6 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,511
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Re: Turn Key off, truck runs...
check to see if your battery cable has melted to the exhaust...been there done that!
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#7 |
Senior Member
Join Date: Aug 2005
Location: OKC, OK
Posts: 2,365
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Re: Turn Key off, truck runs...
If you have an internal regulator alternator installed, you need to install the diode as mentioned in the post above. They will backfeed power sometimes when the ignition switch is turned off and keep running.
Mike
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Mike Redpath |
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#8 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Re: Turn Key off, truck runs...
Others are right. You are getting 12 volts from something back to the ignition wire that feeds your HEI.
Over the years I converted my truck to HEI. After that I converted it from non AC to AC. When wiring up the AC the factory relay that ran the hi-speed fan on the donor truck was dead. I figured no problem, I'll just plumb in a different relay. I wired it so the hi-speed wire from the fan switch went to a relay. The hi-amp wire from the battery to the relay came off of a 2nd junction block I have on the truck because of all the electrical crap I have added to it. To make a long story short, if I have my heater/AC fan on high, and shut the truck off, the truck won't shut off. 12 volts feeds back through the relay to the junction block and from there some how to the 12 volts I have feeding the HEI. So I don't have to figure it out, I just flip the fan off high the 1 in 100 times I turn the truck off and it won't shut off. Now if I had a BRAND NEW "made to fit" harness, and it did this, I'd call and complain. If you need a diode to get around this issue, they should have a big fat note in the descructions stating that if you run an HEI instead of points you need to have a diode keeping current from back feeding into the ignition circuit.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#9 |
Registered User
Join Date: Dec 2004
Location: Saskatchewan, Canada
Posts: 1,371
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Re: Turn Key off, truck runs...
Wow are there a ton of things this could be it sounds like. Ok, I have an internal regulated alternator with HEI, and no diode, as painless didn't mention it. Sound like the problem?
With the truck off, the coil wire has no power. When the truck is on, but not running, the coil wire has power. Battery cable is brand new, and nowhere near the exhaust ![]() There is no electric fan, and no alternator light. All those wires are insulated and tied up.
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1964 Chevy Short Fleet: Tornado 1972 Chevy C10: Fast Orange Secondaries Wide Open |
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#10 |
Registered User
Join Date: Sep 2005
Location: Greeneville, TN
Posts: 27
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Re: Turn Key off, truck runs...
You need the diode. I had the same problem and called their tech line after about 3 weeks of fighting with it and that was what they told me. it took about five minutes and about 3 bucks. Now it works like a charm! THe thread above has the correct part number too, an it is the white wire. good luck!
Last edited by MUNYPIT70; 12-03-2007 at 03:40 PM. |
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