Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is***** the security light stay on or flash? Or does it act normal? Thanks.
No problem. Let me know how it goes, thanks.
Disconnect battery and touch cables together for 10 seconds and reconnect. Let me know if that helps charging problem. Thanks.
Backprobe the alternator Red wire for a 5 volt turn on signal. Backprobe the Orange wire volt voltage equal to the output stud of the alternator. If the Orange wire has low voltage, the alternator will increase output voltage. Check for voltage on the A/C RLY (COMP) fuse in the upper underhood electrical center. If all are good then replace the alternator. Let me know how it goes or if you have more questions, thanks.
Unplug/replug the PCM a couple times and same with 10 amp PCM fuse in location of 8 at fuse box on right side of dash. Let me know if that helps at all. Thanks.
Gray wires goes from alterantor to pin29 of connector 2 at PCM. Red wire goes from pin 61 to alternator. Check resistance on both wires between the points, they should each have under 5 ohms. Let me know, thanks.
I'm suspecting wire harness or connection somewhere which we can hopefully figure out after a couple tests. Let me know, thanks.
No problem, I'll talk to you then. Thanks.
Run a temporary ground from alternator case to battery ground, if that fixes problem then it is.
That is a good reading so if running additional ground helped you will need to clean ground cables. let me know how it goes, thanks.
Before you said it was charging at 17v and now it is charging at 14.7?
Did you run temporary ground?
Disconnect battery and touch cables together for 10 seconds with battery disconnected to try and reset module built into cluster. If that doesn't help the cluster/gauge assembly will need to be replaced. I assumed we were checking voltage with meter from beginning, sorry about misunderstanding. Let me know how it goes, thanks.