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Old 06-12-2019, 01:43 PM   #1
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Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,670
Truck will not turn off

I have a 1979 K5 Blazer and today, after going to run some errands, the truck will not turn off with the key turned off and even removed. I have to pull the hot wire off of the distributor to shut off the engine and pull the negative battery cable to disable the electric fuel pump. I would assume its either the key lock cylinder or the ignition switch, but I figured I would consult y'all first before digging into anything.
1972 Cheyenne
Chevrolet red and white
357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies
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Old 06-12-2019, 02:15 PM   #2
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Re: Truck will not turn off

that would be a place to start
Mongo...aka Greg

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Old 06-12-2019, 02:37 PM   #3
Dead Parrot
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Join Date: Aug 2012
Location: Oklahoma City, OK
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Re: Truck will not turn off

Feedback from the Alt through the Alt light/field wire can cause run on. Normally fails open but you can check by pulling the 2 wire plug out of the alt.

Agree that most probable is ignition switch or the linkage from the key cylinder to the switch.
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