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You didn't mention what kind of beast you're dealing with, but if it has
the "Car-Check System" the control unit gets a signal from the alternator
to tell it if the engine is running or not. If you're grounding of the wire
caused it to mistakenly "think" that the engine is running, and the oil
pressure switch is closed (as it would be if it weren't) this could cause
the oil pressure warning to be activated...
Hope that is helpful...
> From: Jon Meckem <email@example.com>
> To: firstname.lastname@example.org
> Subject: alternator
> Date: Monday, June 16, 1997 4:53 AM
> I was checking my alternator warning light by grounding the D+ wire on
> back of alternator and the oil warning light came on???? Anyone know why
> this would happen?
> thanks for any enlightenment..