which fuse?

Come here to ask for technical help and advice
Post Reply
User avatar
Jamesq123
Posts: 22
Joined: 22nd April 2018 - 5:39pm

which fuse?

Post by Jamesq123 » 11th September 2018 - 6:29pm

hi guys was just wondering which fuse is it or what do i need to get for my rear brake lights? both have stopped working, when i put my head lights on the rear bulbs light up but when u press the pedal they dont come on. any ideas?

User avatar
sparkywig
Posts: 660
Joined: 28th August 2013 - 12:49pm

Re: which fuse?

Post by sparkywig » 11th September 2018 - 8:28pm

Could be the brake light switch on the master cylinder.
Take the two cables off the brake switch and connect them together, if the brake lights come on then it's the switch that's faulty.
If not, it's the fuse/cable/connections.

User avatar
Dave Summers
Posts: 175
Joined: 9th May 2007 - 8:10pm
Location: Culloden, Inverness

Re: which fuse?

Post by Dave Summers » 13th September 2018 - 11:02pm

Doesn't sound like a fuse. Are the dual-filament bulbs in the rear light units fitted the right way round? Sounds like it could be that the headlight circuit is connecting to the brake light filaments and the brake light circuit trying to reach the tail light filaments but not managing because the bulbs won't be seated properly. Or it could be bad earths, which can do strange things - most likely near the light units. Worth checking the wiring at the fuse box and on to the headlight switch too.
Dave
412 Variant
411 2-door saloon

User avatar
937carrera
Posts: 1190
Joined: 7th June 2013 - 11:54pm
Location: North Yorkshire

Re: which fuse?

Post by 937carrera » 13th September 2018 - 11:48pm

http://home.clara.net/hallvw/wire66tl.htm

Any help? looks like fuse 9 on that year.

Do what Sparkywig has suggested as a quick diagnostic
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon

User avatar
Jamesq123
Posts: 22
Joined: 22nd April 2018 - 5:39pm

Re: which fuse?

Post by Jamesq123 » 14th September 2018 - 8:35pm

Thanks guys...will have a check over the weekend

Post Reply