When changing to an internally regulated alt...

[2002maniac]

'75 02

There are two blue wires going from the voltage regulator into the wiring harness. I know one of them is for the alt. warning light, what is the other one for? And which is which?

Thanks

[steve k.]

both of them are warning light wires. one goes from alternator to regulator and the other from regulator to the dash.

steve k.

[2002maniac]

no, it looks like there is one going to the regulator and two going somewhere else (one presumably goes to the warning light)

[Chris_B]

There should be 3 wires going to the alt plug from the voltage regulator.

Colors aside, one is ground to the voltage regulator (D-), one is +12V in (the "warning light"... this should be the blue wire, D+) and one is voltage sensing for the regulator (DF). The positions are marked.

See http://www.bmw2002faq.com/content/view/36/32/

All you need for an internally regulated alt. is D+.

Ping me if you have questions.

[2002maniac]

thanks. That clears it up.