Why will me ignition turn on my motor, but not turn it off?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

corkscrew · 01-22-2007, 01:39 AM

Im new at this whole classic truck thing!

thanks in advance

cstm68 · 01-22-2007, 01:48 AM

does your 12v power wire to your coil go to a switched fuse?

i had the same problem with my HEI until i ran the 12v to a switched fuse.

corkscrew · 01-22-2007, 01:51 AM

ill check that out, any other suggestions? is the ignition shot?

**VetteVet** · 01-22-2007, 01:52 AM

It's hard to say with so few details but here are a couple of ideas.
http://67-72chevytrucks.com/vboard/s...light=ignition

Longhorn Man · 01-22-2007, 09:18 AM

do you have an electric fan? If so, unplug it and see if it stil does it.

68speedalert · 01-22-2007, 10:19 AM

Has i t been converted to an HEI dizzy?

Scratch that.

Has it been converted to an internal reg alternator?

724x4a/cchevy · 01-22-2007, 11:06 AM

Trace the wire that comes out of the distributor cap (hei) and see where it leads. That wire is what kills the ignition so if it always has power, you cant turn it off. If its plugged into the fuse panel, its probably not on a swichable igniton key hot plug, and thats why you cant shut it off.

Sport/Truck · 01-22-2007, 11:55 AM

Have you changed anything lately? There’s a wire on the new style alternator that will keep it running in connected.
s/t

corkscrew · 01-22-2007, 06:35 PM

The electric fan is wired directly to the battery so that wont do anything, also im pretty sure its to do with the alternator. so that should be a quick fix

shifty · 01-22-2007, 06:59 PM

If the distributor is wired directly to the battery, your truck will run forever till you lift that wire. The coil on your distributor should be wired to a 12v ACC power, not constant power. This kills the power to the distributor when the truck is turned off. No power means no firing.

fastwillie 696969 · 01-22-2007, 07:30 PM

i would get that electric fan wired to relay instead off the battery
just my .2 cents any1 else agrees ?

**VetteVet** · 01-22-2007, 07:47 PM

The fans have to be wired through a coolant temperature sensing switch or they would run constantly. They might be wired through the ignition switch and powered on with the key. If so I agree with 70blowngmc about the relay.
They should be powered by a relay anyhow if run through the TSS.

check out this link and read paragraph 2. It shows how the engine could run if the alternator is wired wrong.

http://www.6066gmcguy.org/charging.htm

68speedalert · 01-22-2007, 08:05 PM

Quote:

Originally Posted by 70blowngmc

i would get that electric fan wired to relay instead off the battery
just my .2 cents any1 else agrees ?

Makes sense to me....don't need heavy gauge wire running to the coolant switch. Much cleaner install. Actually, most switches aren't designed to operate the high amp draw of the fan itself.

corkscrew · 01-22-2007, 09:11 PM

I just have a manual switch to turn on the fan, its much easier

corkscrew · 01-22-2007, 09:14 PM

how do you have it on relay?

01-22-2007, 01:39 AM	#1
corkscrew Registered User Join Date: Aug 2006 Location: Canada Posts: 254	Why will me ignition turn on my motor, but not turn it off?? Im new at this whole classic truck thing! thanks in advance

01-22-2007, 01:48 AM	#2
cstm68 Registered User Join Date: Jan 2007 Location: shoreline, wa Posts: 1,565	Re: Why will me ignition turn on my motor, but not turn it off?? does your 12v power wire to your coil go to a switched fuse? i had the same problem with my HEI until i ran the 12v to a switched fuse.

01-22-2007, 01:51 AM	#3
corkscrew Registered User Join Date: Aug 2006 Location: Canada Posts: 254	Re: Why will me ignition turn on my motor, but not turn it off?? ill check that out, any other suggestions? is the ignition shot?

01-22-2007, 01:52 AM	#4
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: Why will me ignition turn on my motor, but not turn it off?? It's hard to say with so few details but here are a couple of ideas. http://67-72chevytrucks.com/vboard/s...light=ignition __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-22-2007, 09:18 AM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Why will me ignition turn on my motor, but not turn it off?? do you have an electric fan? If so, unplug it and see if it stil does it.

01-22-2007, 10:19 AM	#6
68speedalert Semi-Senior Member Join Date: Feb 2003 Location: Washington, MO Posts: 390	Re: Why will me ignition turn on my motor, but not turn it off?? Has i t been converted to an HEI dizzy? Scratch that. Has it been converted to an internal reg alternator? __________________ '68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre '83 Jeep CJ-7, <80,000 miles, original owner '04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer '95 GMC K1500 Extended cab Last edited by 68speedalert; 01-22-2007 at 10:21 AM.

01-22-2007, 11:06 AM	#7
724x4a/cchevy Self-proclaimed LED man Join Date: Nov 2003 Location: Harrisburg, Missouri Posts: 1,021	Re: Why will me ignition turn on my motor, but not turn it off?? Trace the wire that comes out of the distributor cap (hei) and see where it leads. That wire is what kills the ignition so if it always has power, you cant turn it off. If its plugged into the fuse panel, its probably not on a swichable igniton key hot plug, and thats why you cant shut it off.

01-22-2007, 11:55 AM	#8
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Why will me ignition turn on my motor, but not turn it off?? Have you changed anything lately? There’s a wire on the new style alternator that will keep it running in connected. s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

01-22-2007, 06:35 PM	#9
corkscrew Registered User Join Date: Aug 2006 Location: Canada Posts: 254	Re: Why will me ignition turn on my motor, but not turn it off?? The electric fan is wired directly to the battery so that wont do anything, also im pretty sure its to do with the alternator. so that should be a quick fix

01-22-2007, 06:59 PM	#10
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: Why will me ignition turn on my motor, but not turn it off?? If the distributor is wired directly to the battery, your truck will run forever till you lift that wire. The coil on your distributor should be wired to a 12v ACC power, not constant power. This kills the power to the distributor when the truck is turned off. No power means no firing. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

01-22-2007, 07:30 PM	#11
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	Re: Why will me ignition turn on my motor, but not turn it off?? i would get that electric fan wired to relay instead off the battery just my .2 cents any1 else agrees ? __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

01-22-2007, 07:47 PM	#12
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: Why will me ignition turn on my motor, but not turn it off?? The fans have to be wired through a coolant temperature sensing switch or they would run constantly. They might be wired through the ignition switch and powered on with the key. If so I agree with 70blowngmc about the relay. They should be powered by a relay anyhow if run through the TSS. check out this link and read paragraph 2. It shows how the engine could run if the alternator is wired wrong. http://www.6066gmcguy.org/charging.htm __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-22-2007, 09:11 PM	#14
corkscrew Registered User Join Date: Aug 2006 Location: Canada Posts: 254	Re: Why will me ignition turn on my motor, but not turn it off?? I just have a manual switch to turn on the fan, its much easier

01-22-2007, 09:14 PM	#15
corkscrew Registered User Join Date: Aug 2006 Location: Canada Posts: 254	Re: Why will me ignition turn on my motor, but not turn it off?? how do you have it on relay?

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