David Wilkinson wrote:
>
> Hi, I'm appealing to your collective wisdom to help me sort out my brake
> light problem on my 80B. The brake lights don't work. All other electronics
> seem fine - except my headlights brighten and dim with engine speed.
> Anyway, when I look through the moss catalog, I see a brake switch - which
> I can't find on the car!, and a pressure failure switch on the master
> cylinder - which I can find.
David -
The brake switch is located on the rear of the pedal box - between the
box and the firewall. It is positioned next to the clutch master
cylinder. The switch should have a green and a green/purple wire. The
green wire is switched 12 volts - only on when the ignition switch is
turned on. That green wire gets its power from a fuse in the fusebox.
Check the fuse - if good, the other end of the fuse is 12 volts from the
ignition switch relay (this is the front-most relay, not the starter
relay). The 12 volts from the relay to the fuse is on a white/brown
wire. The second wire on the brake light switch is green/purple - it
sends the 12 volts to the lamps. The pressure failure switch on the
master cylinder only lights the warning on the dash.
If all of the above checks out - and you have good bulbs - look for a
bad ground. Rear ground is from the bolt on the back of the license
plate mount inside the trunk. The brighten and dim on the headlights
could indicate a poor ground, poor voltage regulator on the alternator,
or very likely corroded connections on the bullet connectors.
Happy Holidays - take an MG for a drive on the 25th!
--
Wayne Kube wkube@iadfw.net
'79B
Plano, TX http://web2.airmail.net/wkube
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