Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 New fault

On my way home from MOT the hand brake light started to,flash on when using the indicators. Also flashes like an indicator when headlights are put on. Only does this when the engine is running. With engine off all is fine

A M3W irony

At approx what frequency Does it flash under headlights?

Probably an earthing fault.

Does sound like a dodgy earth. Try the hazards.

Yes I think your right. Pulled some relays jiggled some wires. All very unscientific.
Now no problem. Are you thinking that a poor earth somewhere can cause that point to float high in terms of voltage and trigger the brake light?
It was flashing at the same speed as the flashers would go

Yes, If you have a poor earth or pushed back pin there is a chance it will find an earth through another component. It can cause all sorts of weird effects. For instance, brake lights flashing with indicators. It was common in older cars for the light units to corrode causing problems like this but I don't think that is your problem.

There is an earth rail that runs along the bottom of the dashboard switches. Make sure everything is fitted here and nothing adrift. You can see quite clearly through the hole with the box removed. It is the wire that links the switches. Bottom of switch if I remember.

Also, There is a control module for the brake warning light which may have been one of the relays you pulled out. The brake warning light is also a brake fluid level warning light.

Sounds like you fixed it.

Don't you just hate intermittent faults.
Cheers Grockle

Just check the brake fluid level as on some cars the handbrake light can also be low fluid level too (at least in my 4 wheeled Morgan)....