Morris Minor Owners Club

Hi team just put a new wing on rear left side and connected the lights up. now there's a problem. the brake lights work until the head lights are turned on then. when you push brake with lights on it turns all the lights off except a small glow from filament. anyone any ideas why? mot's awaiting on it.
Cheers ben.

First off - disconnect the wires to that light - does the problem go away ?? If yes - reconnect one wire at a time and keep trying. It most probably is an earthing problem - so check the light is properly earthed to the car body.

ok is the black wire the earth one? also does it made a difference if its a fiberglass wing?

Yes, black is earth. With a Fibreglass wing you will have to run a separate earth to a metal part of the body as the light cannot earth through the fibreglass.

edit to correct spilling mistak

Ahhhhhh - now he tells us! Fibre wing

arr ok so do i need to runn a wire from the lighting cluster to the body then? or does the black wire do that. think the black wire is earth to the bumper mount already.

woops only ment to say that once

That's ok - I had a triple post earlier too! The black should be earth - obviously in your case - it isn't!