[V8] back-up light switch

Kent McLean kentmclean at comcast.net
Sat May 2 10:37:37 PDT 2009

Tony wrote:
> That's exactly where you will find the starter relay. Did you not get my 
> email on that? That's what I was talking about hooking the two wires 
> together for. Not the BU lights, which would indeed be on all the time. 
> If you do the BU lights wiring, and hook the two starter wires together, 
> you can eliminate the MFS alltogether.

Oy.  I cut the blue and gray wires, hoping the conversion mechanic
connected the back-up switch wires down at the transmission.  I was
surprised to see 0V at the gray wire.  So I slept on it, and in the
morning tested the *other* side of the gray wire (Doh!). The 12V on
the gray wire is coming *out* of the MFS. (See additions here:)


I'm afraid if I just cut all 8-10 wires, the car won't start. So before
I cut the wires, I'd like to know which wires control the starter relay.
Any one have a clue?


Kent McLean
1999 A4 Avant, V6 Tiptronic
1991 200 TQA #3, with mods
1990 V8 w/5-speed and other mods
gone: '91 200 TQA x2, '94 100 S Avant, '89 200 TQ "Bad Puppy"

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