ignition switch help - truck wont shut off - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hollywood68 · 05-06-2008, 05:13 PM

So the other day I pull in the garage and turn the key, pull it out of the ignition and open the door....then I realize the truck is still running. Luckily its a manual so killing it isnt difficult, but obviously not right.

Some background. This started about a week ago, sometimes it wont shut off and sometimes it shuts off normally. When the key is on the "off" position the tach goes nuts and it runs rough. Like most vehicles of this age the wiring has been messed with, but after inspecting the ignition wiring everything looks clean with solid connections. The truck does have HEI.

Electrical is my serious weakpoint, anyone have any suggestions? I am thinking replace the ignition switch and go from there....

I searched but could not find anything pertaining to this particular problem

thanks for any advice

dznucks · 05-06-2008, 08:25 PM

i have had the same issue awhile back. Change the switch.
i am not sure if that was my problem or not...i also added a relay in the power wire to the ignition. the relay was activated by the ignition switch. one of the two fixed the problem.

berencam · 05-06-2008, 08:27 PM

did you change over to electric radiator fans?

hollywood68 · 05-06-2008, 09:05 PM

thanks for the reply's guys, much appreciated.

No electric fans, I am hoping the switch is all it is. Time to order one up I suppose....

What confuses me is that the tach goes nuts and it runs differently when in the "off" position. To me this means something else may be going on.

Sammy · 05-06-2008, 09:34 PM

IGN switches are still available at your parts store. They are $18-$25 new.

chevy72blu · 05-06-2008, 09:38 PM

double check your alternator wiring. Have you messed with it at all lately? The same thing happened to mine when I converted it to a 1 wire-internally regulated set up.

hvychve · 05-06-2008, 09:41 PM

Chevy72blue, you took the words out of my mouth, unhook your main battery feed at alternator, and try it, sometimes what happens is the diodes go bad and can feed voltage back up line, a/c voltage keeping system alive while alt. is turning. goood luck

hollywood68 · 05-06-2008, 10:46 PM

Local parts store has the switch, $25, being held for me. I'll replace it and go from there. The alternator info is great, I would like to upgrade as some additional electrical accessories may find their way into the truck at some point...

Thanks for the advice guys

05-06-2008, 05:13 PM	#1
hollywood68 Registered User Join Date: Mar 2008 Location: Denver, Colorado Posts: 69	ignition switch help - truck wont shut off So the other day I pull in the garage and turn the key, pull it out of the ignition and open the door....then I realize the truck is still running. Luckily its a manual so killing it isnt difficult, but obviously not right. Some background. This started about a week ago, sometimes it wont shut off and sometimes it shuts off normally. When the key is on the "off" position the tach goes nuts and it runs rough. Like most vehicles of this age the wiring has been messed with, but after inspecting the ignition wiring everything looks clean with solid connections. The truck does have HEI. Electrical is my serious weakpoint, anyone have any suggestions? I am thinking replace the ignition switch and go from there.... I searched but could not find anything pertaining to this particular problem thanks for any advice

05-06-2008, 08:25 PM	#2
dznucks Registered User Join Date: Feb 2006 Location: Smyrna, Ga Posts: 1,647	Re: ignition switch help - truck wont shut off i have had the same issue awhile back. Change the switch. i am not sure if that was my problem or not...i also added a relay in the power wire to the ignition. the relay was activated by the ignition switch. one of the two fixed the problem.

05-06-2008, 08:27 PM	#3
berencam Registered User Join Date: Aug 2007 Location: branson mo Posts: 933	Re: ignition switch help - truck wont shut off did you change over to electric radiator fans? __________________ 69 chevy c10 350 3 speed manual wood bed build thread here r.i.p. 70 c10 auto 350 build here

05-06-2008, 09:05 PM	#4
hollywood68 Registered User Join Date: Mar 2008 Location: Denver, Colorado Posts: 69	Re: ignition switch help - truck wont shut off thanks for the reply's guys, much appreciated. No electric fans, I am hoping the switch is all it is. Time to order one up I suppose.... What confuses me is that the tach goes nuts and it runs differently when in the "off" position. To me this means something else may be going on.

05-06-2008, 09:34 PM	#5
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: ignition switch help - truck wont shut off IGN switches are still available at your parts store. They are $18-$25 new. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"

05-06-2008, 09:38 PM	#6
chevy72blu Registered User Join Date: Apr 2004 Location: Las Vegas, NV Posts: 2,188	Re: ignition switch help - truck wont shut off double check your alternator wiring. Have you messed with it at all lately? The same thing happened to mine when I converted it to a 1 wire-internally regulated set up. __________________ RIP EastSideLowLife '72 C20 SWB convert. 5 lug, LS1/4l60e

05-06-2008, 09:41 PM	#7
hvychve To The Levy Join Date: Jan 2007 Location: california Posts: 391	Re: ignition switch help - truck wont shut off Chevy72blue, you took the words out of my mouth, unhook your main battery feed at alternator, and try it, sometimes what happens is the diodes go bad and can feed voltage back up line, a/c voltage keeping system alive while alt. is turning. goood luck

05-06-2008, 10:46 PM	#8
hollywood68 Registered User Join Date: Mar 2008 Location: Denver, Colorado Posts: 69	Re: ignition switch help - truck wont shut off Local parts store has the switch, $25, being held for me. I'll replace it and go from there. The alternator info is great, I would like to upgrade as some additional electrical accessories may find their way into the truck at some point... Thanks for the advice guys



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