Odd issue noted with lights on SPF.

[Glenn Peterson]

This weekend I moved a new toolbox in front of where I park my GT40 which gives me a reflection I haven't normally had in the past. It was after dark when I pulled the car back in but I didn't have the headlights on because I was just pulling up about 10 ft and could clearly see. As it turns out, however, the low beams came on when I hit the brakes (something I assume has been happening all along).

On Sunday I did some experimenting and noted that if I turned my dash lights on (they are generally off) then the headlights only come on enough to barely glow. I also found that with the dash lights switched off and the fog lights switched on, the fog lights also come on with the brake lights.

I have not monkeyed with the switches or electronics beyond running a hot wire for the hydraulic front lift kit to the ignition "on" post.

Is this normal? I can't seem to think of the reason for it, but I've never had a GT40 before so......

 

[Rick Muck- Mark IV]

You need Blas's wiring diagram. It appears there is a "backfeed" somewhere. Was your car completed by a shop? If so, the electrics should have been checked and this discovered and corrected before you got delivery of the GT.

 

[Bob Putnam]

That type of backfeed is usually caused by a bad or missing ground somewhere.

 

[Stephen Ducker]

The brake lights seem to be a common factor in most of your problems. They seem to be earthing through other circuits, ie the headlamps, creating a backfeed as Bob suggests.
Make sure the correct bulb type is fitted & then check the earth/ground on the bulb holders.
(ie start simple ! then move onto the other earth/ground points)