To help in the search the relevant diode has white/red (starter relay) on
one end and green/orange (brake test switch and handbrake switch) on the
other.
PaulH.
----- Original Message -----
From: Jim Stuart <jimbb88@erols.com>
To: MG list <mgs@autox.team.net>
Sent: Friday, May 12, 2000 2:39 AM
Subject: parking brake start, heater valve
>
> Parking brake start is a common problem in 77-80 MGB's. It is a bad
> diode in the brake warning circuit. There are 2 of these diodes in the
> late model cars, not always shown in the wiring diagrams. They are found
> by removing the glove box & following the wires until you find a small
> rectangle 1/2" x 3/4" with wires in & out. The diode is usually brown,
> black, or red in color. It has a male terminal on one end, female on
> the other so you can only plug it in in one direction. I could never
> find a source for them, so I relied on pulling them from salvaged
> harnesses or cars.
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