Lots of interesting speculation so far but:
The mystery component is a "lamp test" relay. It momentarily
illuminates the brake warning lamp and EGR service lamp when
you crank the starter. It is wired as follows:
The green/white wire (terminal C1) goes to EGR light (indirectly)
& service interval switch.
Terminal C2 & W2 are connected together and to chassis ground.
A black/blue wire connects from W2 to the Left hand seat (not
seat belt) switch.
Terminal W1 has two white/orange wires. One comes from the
starter solenoid (+12V signal in) the other goes on to the
seatbelt timer/buzzer/annoyance device.
Terminal C4 has a black/purple wire which goes to the brake
warning light.
This wiring scheme is unique to 1976 model US spec. cars.
'76 model cars have J type Overdrive with no OD relay.
Haynes schematics can be useful, but beware, they contain
errors.
Hope this helps.
--
LBC'ing U,
Bob (& Spitfires)
[digest mode]
http://home.att.net/~stan.part
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