Trailblazer

BIL has a Trailblazer with a 4.2, '03 (?), ~95KM.

Voltage gauge 'pulses', swings up and down, sometimes between 13.5 - 14.5,
other times between 9 - 15. He removed battery ground with the engine
running, no change to behavior. No codes.

Voltage regulator?

TIA

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1 12th November 11:20 commentator External User Posts: 1	Trailblazer BIL has a Trailblazer with a 4.2, '03 (?), ~95KM. Voltage gauge 'pulses', swings up and down, sometimes between 13.5 - 14.5, other times between 9 - 15. He removed battery ground with the engine running, no change to behavior. No codes. Voltage regulator? TIA