high level brake light fuse

[Topgear16]

which is the fuse for the high level brake light zt-t

[Topgear16]

does no one know the answer?????

[HarryM1BYT]

Originally Posted by Topgear16

does no one know the answer?????

I would very much doubt there is a separate fuse, just for the HL brakelight. If your other two brakelights are working, you can safely assume it is not a fuse.

I would suggest removing the HL and testing it across 12v (polarity may be important) and if that works, look for a break in a cable or poor connection.

[Topgear16]

Thanks Harry, i just used a test light on it and theres no power, but how do i trace the wiring back to the switch?

[HarryM1BYT]

Originally Posted by Topgear16

Thanks Harry, i just used a test light on it and theres no power, but how do i trace the wiring back to the switch?

No switch, as such. It is triggered by an hall effect switch at the brake pedal, which sends a signal to (I think) the light switch module, which then tells a boot mounted module to turn the brake lights on. Its all multiplexed wiring these days, no simple switches.

I think, as a first step - you should ascertain whether you have you lost the earth or the 12v at the HL light. Either one or both missing will cause the fault.

Assuming 12v is not appearing at the light when pedal is pressed - If both of your rear wing cluster brake lights are working, you need to trace the wire from the HL light, back to source. It looks as if the 12v ought to be appearing on a purple at the HL brake light and is fed via some sort of in line choke then eventually to a lighting module in the boot area.

[Topgear16]

Thanks again Harry i will try and source the power, if that fails i thought i might tap into the brake light feed and run a cable up to hl light what do you think of that idea?

[HarryM1BYT]

Originally Posted by Topgear16

Thanks again Harry i will try and source the power, if that fails i thought i might tap into the brake light feed and run a cable up to hl light what do you think of that idea?

I will not comment on that idea, because I simply do not know what effect it might have on the ECU.

As said, find out which is missing +ve or ground, then we can maybe progress it from there.

I guess you know about the trick of sticking a sharp pin through a cable, to make contact with it for test purposes? Those pins which seamstresses use which have a small plastic ball at the end work well, but I don't know what they are called or even used for.

[Topgear16]

ok Harry i`ll take your advice and get back to you, probably be tomorrow now Thanks Terry

[berkshirelad]

Originally Posted by HarryM1BYT

I guess you know about the trick of sticking a sharp pin through a cable, to make contact with it for test purposes? Those pins which seamstresses use which have a small plastic ball at the end work well, but I don't know what they are called or even used for.

Much as I hesitate to post that I even know....

They are called marking pins and used for dress-making and tailoring.

[HarryM1BYT]

Originally Posted by berkshirelad

Much as I hesitate to post that I even know....

They are called marking pins and used for dress-making and tailoring.

I will not even ask how you know that