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Interesting Alternator problem last night


Guest Anonymous

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Guest Anonymous

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While driving home last night, my headlights looked dim.

When I got home and turned the ignition off, the charging telltale did not light up, just the oil pressure. So it seemed like I had no alternator and the light did not warn me that it was not working.

In the dark with no test equipment, I poked around.

Turned out the screws securing the voltage regulator had backed off a bit.

Seems as though they ground the regualtor to the chassis.

I tightened them and the warning light came on, started the car, it went out and nice bright headlights again!

So I guess that's another area that should be cleaned and checked for corrosion and bad contact.

HTH,

Tony

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Guest Anonymous

Your symptoms happened to my car many years back. That's one of the things that prompted me to go to an internally regulated alternator (that and higher amperage...)

18 years later, the 320i alternator is working out fine.

Kevin

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Guest Anonymous

If we are to believe the wiring diagram, the regulator gets its ground from the brown wire to the alternator. Can someone who has disassembled a regulator confirm that there is an internal connection to the case? Perhaps your observations resulted from some other factor, such as inadvertent jiggling of a loose connection.

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Guest Anonymous

...I noted that there is a wire that grounds through a connection to one of the mounting screws for the regulator. It comes from the harness that goes into the regulator. Does yours have this wire?

-Dave

Colorado '71

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