Paul:
If you don't have a continuity checker. GET ONE, you will be using it on a
regular basis. A cheap Volt/Ohm meter is really the way to go, both are
minimal essentials in a tool box.
Excuse me if I get a bit elemental. The switch has three positions. In the
first position.OFF. none of the terminals is connected to any others.
In the second position. SIDE. One of the terminals is connected to only one of
the other terminals.
In the third position. HEAD. One of the terminals is connected to all of the
other terminals.
With the 4 terminal switch, (I think) two of the terminals are always connected
together, but I may be wrong they may only connect together in the HEAD
position. Later cars only had 3 terminals, which made things a bit easier.
The Brown wire is the hot feed. It is connected to the terminal that connects
to one terminal in the SIDE position, and all terminals in the HEAD position.
The Green/Red wire is the side light circuit feed and connects to the terminal
which is live in the SIDE position.
The two Blue wires are the Headlamp switched feeds which connect to the two
remaining terminals.
Since there are no ground leads involved, you can play mixnmatch until you get
it right without frying anything, but the above should get you going.
Kelvin.
-----Original Message-----
From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net]On
Behalf Of Paul M.
Sent: Friday, April 23, 2004 10:14 AM
To: mgs@autox.team.net
Subject: Headlight switch help...
Gak, I screwed up. I pulled my headlight switch out
of my 1971 MGB tourer to check something, and now I
have NO idea which wires went where. I was playing
around with it, I keep getting my combinations screwed
up. I can get the headlights to work, or the running
lights, or the taillights, but not everything at the
same time. Things seem to work even when hooked up to
different poles...
Worse, although I am not intimidated by rebuilding an
engine, even the simplest wiring task completely
baffles me. I am an electrical idiot. The wiring
diagram looks like an alien cookbook to me.
There are four wires and four poles:
Two of the poles are stacked on top of each other
(closest to the driver's door), and they come off the
switch in a "Y" shape. The other two poles are also
stacked on top of each other, but are closest to the
passenger's door.
Two of the wires are light blue (one with a red
connector and the other with a light blue connector),
one is brown, and one is green/red.
If anyone can help me figure out which goes where, I'd
be forever grateful.
Sorry for the rudimentary question, but I am totally clueless.
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