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Front Lights On When I Brake


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#16 rog99

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Posted 19 May 2010 - 12:30 PM

I've just looked at mine - there are two multi-plugs behind the panel above the rear wheel arch.

The blue connector has an Orange and an Orange/white leads - these are the side lights.
Have you got a multimeter? Can you check if you are getting power on these?

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#17 Blink

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Posted 19 May 2010 - 12:35 PM

I've just looked at mine - there are two multi-plugs behind the panel above the rear wheel arch.

The blue connector has an Orange and an Orange/white leads - these are the side lights.
Have you got a multimeter? Can you check if you are getting power on these?


I havent mate, just switched hazards on to check, these do not work on rear either, so safe to assume I have nothing on working on the rear of the car?

#18 rog99

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Posted 19 May 2010 - 12:50 PM

Not having a multimeter trying to trace electrical faults is a problem...

Alternatively, if you have a soldering iron you could solder a couple of wires onto a 12v bulb and use that for basic tests.

Connect one side to an earth point and carefully touch the other lead on the pins of the multi-plug and see what you get., make sure you don't short across the pins.
There is the possibility of course that the wiring loom is damaged before it gets as far as the plug but at least this will confirm this or not.

Failing that the only thing I can suggest now is to unplug both rear clusters and the high level brake light and plug them up one at a time and see if anything works.

#19 Blink

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Posted 19 May 2010 - 02:17 PM

ok......

I made up a simple light bulb circuit as suggested, went to the multiplug at the rear, all dead.

I believe (please correct me if im wrong) these then connect through the car to another main plug at the front passenger footwell underneath some trim. At this point they are live. (Bulb lit up and flashed for hazards)

So I THINK the wiring loom is ok at least to here, and there is a break from the plug in the footwell to the plug at the rear of the car?

That make sense?

#20 Blink

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Posted 19 May 2010 - 02:36 PM

Scrap that, multi plug in passenger foot well is fine, has to be screwed in to make connection......school boy error!!!!

Rear indicators and sidelights including reg lights are ok.

I havent attempted to insert another fuse into brake system yet.....

#21 rog99

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Posted 19 May 2010 - 03:04 PM

Scrap that, multi plug in passenger foot well is fine, has to be screwed in to make connection......school boy error!!!!

Rear indicators and sidelights including reg lights are ok.

I havent attempted to insert another fuse into brake system yet.....


Good...at least you are getting somewhere!

So it is just the brake lights now? which brings us back to the clusters and the H/L brake light.
I would still say to unplug both rear clusters and the high level brake light and plug them up one at a time and see when the fault occurs.
Roger

#22 Blink

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Posted 19 May 2010 - 04:37 PM

With all brake lights unplugged it blows fuses the second I touch the brake pedal. I removed the brake plunger mechanism and inserted a wire to both contacts to complete the circuit still blows so plunger itself is ok.......any ideas?

It also seems to have blown the light switch fuse again.

Edited by Blink, 19 May 2010 - 04:44 PM.


#23 rog99

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Posted 19 May 2010 - 04:44 PM

If you undo the multi-plugs at the rear of the car does it still blow fuses?

If it does the fault is somewhere before them if it doesn't the fault is in the rear wiring somewhere.

Divide and conquer!!

#24 Blink

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Posted 19 May 2010 - 05:05 PM

before I disconnected the rear multiplugs the wires leading into the light switch were very hot (too hot). I disconnected the blue plug fuse blew, reconnected and removed the grey plug, all ok with no heat in the light switch wiring, so problem is at rear of the car?

looking at the grey multiplug there is a green wire with yellow stripe, it appears to have fused itslef to a couple of other wires where it has touched them. Anyone know what this wire operates?

#25 rog99

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Posted 19 May 2010 - 05:14 PM

I would say it definitely is.
The two normal brake lights go through C50 [the blue one] and the high level through C48 [the Gray one] I think.
Just to confirm this, when you disconnected the grey one do the cluster brake lights work OK?

#26 Blink

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Posted 19 May 2010 - 05:33 PM

I would say it definitely is.
The two normal brake lights go through C50 [the blue one] and the high level through C48 [the Gray one] I think.
Just to confirm this, when you disconnected the grey one do the cluster brake lights work OK?


Grey plug is disconnected, I have cluster brake lights......

I undid the rubber that goes from roof to tailgate, there are two broken and melted wires in there, a green with yellow stripe which I think is high level brake light and green with blue stripe which I think is heated rear screen....

So I believe problem is solved!!!!

The grey multiplug is isolating the tailgate wiring then is that right...

That being the case im ok to drive and visit either ford or scrappy to try and aquire a new loom for rear.


Roger cant THANK YOU enough your help has been brilliant and has kept me sane lol, also saved me a fortune with calling out an auto electrician.

#27 rog99

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Posted 19 May 2010 - 06:58 PM

Glad to have been some help.

BTW, the green with yellow stripe is the high level brake light.
My circuit diagram says that both the rear wiper and heated rear screen are Green Blue.

Roger

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