Had after market radio installed on saturday drove a couple times after. on sunday night the truck would not start. appeared to be battery. had battery tested on monday was told either batt. or alt. had batt. installed cranked perfect by wed. will not start will turn over but not start. does not sound like batt. down.
Sounds like the computer is in lock down. My sister has a 99 cavalier and used a cut key to start her car and a couple days later the car would not start. Tried everything then had to get a gm computer to reset the ecu. I have heard about the anti theft systems in GM cars that can cause this as well. Look into it if you cant figure anything out. There might be a code to input into the radio to take it off as well.
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i can solve my own problem! truck was out of gas! my gas hand had stopped working a couple weeks before! I actually didn't figure this out on my own, had a mechanic look at it, thank god he was honest.
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