John,
You may have a short to ground somewhere in the switch. Disconnect all
wires connected to the overdrive relay except whichever of W1 of W2 is
connected to ground. Connect one lead of an ohmmeter to ground and probe
all of the overdrive terminals with the other lead and note which terminals
show continuity to ground. Without seeing a schematic I can't be sure, but
in all likelihood none of the other terminals (except one of the W's which
you have determined should show continuity to ground) will show continuity
to ground if the switch is functioning properly. If the terminal of the
overdrive which the Green wire is connected shows continuity to ground, the
switch is most likely bad. Let us know what you find.
Gary
'73
----- Original Message -----
From: "jhaeg" <haeg1@mninter.net>
To: "6 pack list" <6pack@autox.team.net>
Sent: Saturday, November 01, 2003 1:17 PM
Subject: 75 electronic overdrive schematic
> My problem: The fuse supplying power to the GREEN wires is blowing. The
fuse
> will not blow if I disconnect the overdrive on/off switch.
>
> Here is what I can figure out:
> -C1 and C4 are the overdrive relay contacts.
> -W1 and W2 are the overdrive relay windings.
> - One side of the overdrive switch is tied directly to the GREEN switched
B+
> line.
> - The heavy gauge brown wires connect to C1, and are switched B+.
> - The C4 wires (WHT/RED and WHT/YEL) have continuity between them, and
seem to
> be the electrical load that gets turned on by the relay. One should go to
the
> overdrive solenoid, but what does the other one do?
> - The wire at W2 is also (WHT/RED), and has continuity with the (WHT/RED)
> electrical load wire. This looks to be some type of latching circuit, but
I'm
> going to need a real schematic to proceed.
|