92 gmc sierra whie running seat belt light goes on than the check engine...

el10jando

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...blinks than truck shuts off any idea?
I took the alternator to 2 different auto parts and tested it and it failed at both places. Could this have been the problem?
 
If your ignition is worn it could cause this,but if you get engine lights take it to a shop it might save you a towing bill.
 
Sounds like a computer problem. An "ECU" electronic control unit perhaps. Other than that an electrical short sounds likely which is hard to locate
 


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