Here's one for you:
I just bought a TR7 for my wife to drive. It's a Bosch injected 1981 model, US
specs, LHD without air conditioning. I'm currently fixing all the modifications
of the prior owner. During my inspection I found a relay in the engine
compartment on the passenger side of the firewall just above the wiper motor
which isn't connected to the rest of the car's electrical system.
The relay has three brown and one black with blue stripe wires running from it.
The black w/blue stripe wire runs into a wire loom going to the interior, but
the brown wires are not connected to the rest of the electrical system. Two
of the brown wires are thick (about 12 gauge), one thin (about 16 gauge). One
of the thick brown wires runs into a four-way connector with wide "Lucar" male
connectors (which isn't connected to anything else).
The relay, a black Lucas unit, is a single-pole, double-throw type with the
thin brown lead supplying the power and the black/blue wire obviously (at least
to me) acting as the ground lead. The relay is wired as a SPST switch,
controlling whatever is connected to the thick brown wires. An operational
check of the car's electrical devices shows that all work normally.
The wiring diagram I have (Bentley manual)does not have this relay on it. I've
examined the diagram for a relay with three brown and one black/blue wires
running to it and cannot find any. I can't even find the black/blue wire! An
inspection of the wiring in that part of the car shows nothing amiss, all
wires seem to go to original locations. If I had to guess, I'd say that it
controls something that gets its power from a thick brown wire comming of the
wire junction on the positive battery lead to get its power, but after that I
throw my hands in the air.
Being a neophyte on this car, should I be concerned, or, since this doesn't
seem to affect anything, should I just drive the car and pretend ignorance??
Bruce Clough Internet cloughbt@batman.flight.wpafb.af.mil
(513) 255-2832
'54 TR2
'62 TR4
'81 TR7
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