We are working on a 96 Deville. The guy putting the a/c compressor didn’t tell us he had to take the oil filter off to get the compressor on it. We came in the next morning and started it to back it out. I seen the oil puddle and shut it off. Now it turns over’ but we can’t get it to start. We changed the key and tumbler we got from the dealer and the security light is not flashing.
Assuming the battery is fully charged. First thing to check would be to see if you are getting battery voltage at the “S” terminal on the starter when the key is held in the “START” position. If you see battery voltage, confirm you also have a good ground at the starter and then replace the starter. If no voltage, trace back and replace/repair.
Battery voltage path. Key -> Park/Neutral switch -> Starter Relay -> S terminal on starter.
2 fuses involved. Check them both. BATT1 50A fuse and BATT2 30A fuse
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