> Can anybody confirm the position of connecters C1, C2, W1 & W2 relative
> to the relay when it's in place against the firewall? I can't read mine.
Sorry, I don't have one handy to look at. But it's easy enough to figure
out with an ohmmeter ... W1 and W2 will have a relatively low resistance
between them (something like 100 ohms) while C1 and C2 will show no
continuity at all. And you can safely ignore the numbers, all that matters
is which two are the relay contacts (C1 and C2) and which two are the relay
coil (W1 and W2).
FWIW, I believe the wiring diagram shown on page E-23 of the factory
workshop manual (and copied in many other places) is wrong. It matches
neither the photo, nor the wiring I found on TS39781LO. According to the
diagram and the text, there should be only one wire from the relay into the
hole in the tunnel, but the photo (and my car) clearly shows two wires.
Instead, the wire from the starter pushbutton should run to the operating
switch on the dash, then to a coil terminal on the relay. The other coil
terminal is wired to the isolation switches on the gearbox. Then the wire
from the ammeter should go to one of the contact terminals on the relay, and
the other contact terminal goes to the solenoid.
IMO, it's a very worthwhile modification to add a fuse into the wire from
the ammeter. Although fuses are normally to protect the wiring, in this
case it will also protect that expen$ive solenoid in case the pull-in
contacts don't open for some reason. I also added a fuse to the wire from
the starter switch; and a diode across the relay contacts.
> BTW is it supposed to be contact side up so water can gather? It was
> when I took it off. ;)
Both the book & my car show 3 terminals down, one up.
> While I'm at it what about the power for the heater fan switch, where's
> it supposed to come from?
Depends on the vintage of your car. On early cars with non-self-parking
wipers, the heater fan power comes from the wiper switch (as per page N-13
of the factory workshop manual). I've never found documentation for the
later cars, but based on observation, I believe it was wired to the hot
terminal on the fuel gauge. Could be any "green" circuit connection, but I
believe that's the one the factory used.
Randall
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