Okay. Here is my attempt at wiring in a horn relay. I did this a couple
months ago using instructions borrowed from the bulletin board at the MG
Cars Enthusiasts' Club site, who got it from Moss Motoring. Words first, a
crude drawing to follow:
On later B's, the horn push makes the horn blow by completing the ground
circuit on a two-wire horn. To install the relay:
1) Cut the purple/black (PB) horn ground wire from the fatter loom (make
sure you do this between the horn push and the first horn, not between the
two horns).
2) Get a spare MG ignition relay (or similar relay purchased from an auto
parts store) and attach the horn push side of this wire (the loom side) to
terminal W2 on the starter relay.
3) Take the other end of this wire (the horn side) and attach it to
terminal C1 on the relay.
4) Then run a wire from an positive wire (or the battery) to terminal W1 on
the relay.
5) Take a new wire and ground it under the hood somewhere. Run the other
end of this wire to terminal C2 on the relay.
When you now depress the horn button, you ground the relay, which closes
the negative side of the horns.
Drawing:
|
| C2 (87)
o
W1 (85) o
__|___________ |
| \ | /
| \ |====/
| \ | /
|____\_________| | C1 (30)
|
W2 (86)
My apologies if the drawing doesn't come out right. Please use your editor
to try to get it into a format that resembles the drawing on the relay
cover.
Good luck!
Scott
1978 MGB
----------
> From: Mike Lishego <mikesl@tartan.sapc.edu>
> To: MG List <Mgs@autox.team.net>
> Subject: Headlight & horn relays?
> Date: Thursday, November 19, 1998 11:42 AM
>
> Hello all,
> I've been mulling over adding a relay to my headlight and horn wiring
> circuits since it was a topic of discussion a week ago. I have two
relays
> in the trunk awaiting usage (one old starter relay and one like-new
> overdrive relay). If anyone has done these conversions, will you please
> drop me a line on how you wired the relay up?
>
> Also, will the two relays I have do the job? I don't see why not, as
I
> used the overdrive relay as a starter relay for a few days once. Also,
what
> effects will these relays have on my car? I remember one lister saying
that
> his horn was much more powerful with a relay (I need that). Will adding
a
> relay make my headlights brighter, or will it simply dissipate heat
better?
>
> BTW, thanks for the advice about the oil pressure. I watched it
today,
> and it did the same thing until the needle started moving up a little -
then
> it quit. So I guess all is well! (That sound you just heard was me
> knocking wood!)
>
> Michael S. Lishego
> http://www.geocities.com/MotorCity/Speedway/3706/
|