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Old January 29th, 2013, 09:17 AM   #2
Flexin' XJ
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Repalced alternator connector thinking I have a broken wire at the connector. Worked for a minute then the voltage dropped in small incriments until it was about 11.5v.

Tested brown wire at the connector
Disconnected - KOEO - 9.88v
Backprobed - KOEO - 1.3
Backprobed - KOER - 1.3 (no switching)

I have read somewhere GM uses a 5v signal to turn on the alternator. Why am I reading 9.8?

I am really stuck. I don't have access to GM diagnostic info anymore.

My other option is maybe the new alternator is defective. But without proper diagnostic processes I don't want to keep throwing stuff at it.
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