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What is this relay, and why does it look like it's missing a trace? 700 1990

posted by  JPaganel on  Sat Apr 26 06:50 CST 2008
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last visit: Sun Feb 26 18:07 CST 2012
[RELATED]

As I was resoldering the relays on my 1990 745, I pulled one that puzzled me.

This relay is a black one with three prongs, it sits right in the middle of the relay board behind the lock relay. It's marked SAE J590 and SAE J945 in white letters on the side.Top is marked like this:

TBB76 DOT
4DB 003750-31
2(4)x21W/32cp-12V

First, I noticed the middle prong was discolored by head or electrical arcing. When I cracked it open, the trace running along the right side of the circuit board looked odd. I can't quite tell if the metal is gone and only the lacquer is there, or if it is lacquered over.

What is this relay for? Should that trace look like that? If it is burned off, I could solder a thin wire strand in it's place, but I have to wonder what made it burn.






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