Larry,
When I recently installed a fog light and a driving light on my MG TD,
this is what I did.
I'm not very good at electrical or electronic things, so I heeded the
lists' and others' suggestion to use a relay. Problem was I had no idea
really what a relay was or what kind to get or how to hook one up.
I searched the internet and came up with a very nice sketch that shows
how to hook up the circuit. Go to
http://www.classictruckshop.com/clubs/earlyburbs/projects/bosch/foglites.htm
It talks about Bosch relays, so I went searching for such a creature.
Little did I know at the time that what was meant by a Bosch relay is
really a Bosch type relay. Apparently Bosch has set the standard for
this type of relay and the terminals are marked with the same numbers on
any Bosch type relay.
Somewhere I found a reference to a company called MCM that has relays
for around a dollar (US). Seemed to me to be a good price. I found
this website:
http://www.mcminone.com/search.asp?keyword=relays&btnSubmit.x=8&btnSubmit.y=7&btnSubmit=GO&restrict=3829443
I liked the 40A relay because it looked like the mounting flange is
metal where the 30 A doesn't appear to be. The 40A is 4 pin and the 30A
is 5 pin, but the wiring diagram appeared to only need 4 pins, which is
correct.
You can also get relay sockets, but I chose not to because I wanted to
use appropriate color wiring, not what came with the socket. They also
have fuseholders, but again they already have the wires on them and I
wanted the correct color wires going in and out of everything.
I don't know if any Austin-Healeys had foglights or driving lights as a
factory option, but since I was working on an MG, which did have that
option, the correct wire was already there in the stock wiring harness,
and also a switch on the dash. The color wire is red with a yellow
tracer. I figured I'd need some more wire, especially since I was
wiring up two different lights (fog and driving), so I checked British
Wiring's website and they do sell wire by the meter and also sell inline
fuseholders that you solder the wires to their terminals and also sell
the fuses. I bought all of that from them. They have a very nice
online catalog which I had to print out to make much sense of it. I'm
old school and usually prefer a hard copy.
You will need to decide where you want to feed the relay from. I fed it
from a brown wire which means it is hot all the time.
Since you are doing driving lights, you should feed your switch from the
high beam wire, which I believe is Blue/red. Check your wiring diagram
for your car and the harness to see where you can hook up to one that
color. That way you can only use them when the high beams are on, which
I believe is legal in most states. This was just covered recently on
the list. I fed my fog lights from a parking light wire at the light
switch.
I was quite happy with the result and was glad I did some research and
then didn't just use some generic auxiliary light kit.
Good luck.
Charlie
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