No crank from key

Tiny
TONEY53
  • MEMBER
  • 1994 GMC SIERRA
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 151,000 MILES
I have been going back and forth with this truck. Worked great then one day went to go to work and it would not fire from key switch. Seemed like a fuse blew. All fuses tested good multiple times, replaced battery, replaced starter and solenoid, neutral safety switch, and finally ignition switch. I now have a dead man switch that cranks the truck. Truck runs great in the on position fuel pump and accessories all work. I am thinking it may be a ground I am having other electrical issues at this point. Blower motor intermittently cuts out. The radio and equalizer both work but no sound out of speakers. Let me know what you think. Also, tester inline fuses directly off positive side of battery and didn't see any burnt wire on fuse-able links on firewall. I also changed the ignition control module. Forgot about that one. When I turn the key to start all interior lights dim and AC and radio turn off, but outside headlights do not dim. This thing has me all kinds of flustered. Hopefully I am reaching out to better mechanics than myself. All help is appreciated.
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Tuesday, February 7th, 2017 AT 4:39 PM

4 Replies

Tiny
LOU P
  • EXPERT
Hello, well first let me ask do you have a test light? We can most likely figure this out with a simple test light. Slight possibility we need a meter, but a test light would do the trick. I can walk you through some tests to get your truck fixed up. I have been a tech for twenty years or so and have the utmost faith we can fix this.
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Tuesday, February 7th, 2017 AT 5:13 PM
Tiny
TONEY53
  • MEMBER
So sorry for the delay. Today I took a test light and traced the ignition wire all the way back to the key switch. No power all the way down, including fuse. All fuseable links tested good. Lost my way and started at the ignition switch and found my problem. My grandfather bought this truck brand new and 94. He had an after market security system with ignition kill. Since no one knew and the technician did a bang up job hiding it it took me months to find. Bypassed the security and were working just like new. Thanks for your help. If you ever have someone with a similar situitation tell them to find the black box hidden under their dash.
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Thursday, February 9th, 2017 AT 6:16 PM
Tiny
MHPAUTOS
  • EXPERT
Thanks for the feed back, many after market immobilizers and alarms cause problems years after they are fitted and often 2 or 3 owners on who may not know that the systems have even been fitted if they are well hidden.
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Saturday, February 11th, 2017 AT 2:24 AM
Tiny
LOU P
  • EXPERT
Glad you got it and replied back, amazing what secrets cars hold :) hope to hear from you again in the future.
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Saturday, February 11th, 2017 AT 5:01 AM

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