Power Mirrors

[Incantation]

Hey guys,

Finally got my m3 style mirrors with signals in them and they're also power. I had em painted and they're ready to be put on, but one problem:

On the stock mirror there are 4 wires to control the mirror, while on the new mirror there are only 3. ?!?!? .. yea i know i know.. that's what I get for buying from ebay. Anyway, I would still like to get these to work; the signal wires are simple enough to figure out, but I was wondering if anyone knows of a wiring diagram that will tell me what colours are what for the existing mirror controls?

Any help is much appreciated!

[Alan_525i]

The fourth wire might be for the heat? Don't know for sure what the wires actuall do but this may help you -

http://home.comcast.net/~asilver33/mirror.htm

The brown wire is always ground(on the body at least). The ground on the mirror is likely brown also. The other two probably operate the motor. Connect them one way and see if the switch operates correctly. If not switch them and you should be set.