trailer lights issue

[dan494]

Earth would maybe affect all lights, maybe a chaffed indicator wire to socket earthing out.

What happens when hazards are put on.

Depends how it's wired. I've just installed a towbar on our car and used a dedicated wiring loom that plugs into the rear lights and draws it's own power source from behind a cigarette lighter in the boot. It's earthed separately and has it's own relay and fuse

 

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[Steve Bullman]

Get yourself one of these..............S.2297 Trailer Board 7 Pin Socket/Plug Tester (12V)

 

 

 

 

 

Never seen those before, pretty cool

 

 

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[Stumpy Grinder]

If the same happened with two different trailers, then it is clearly the truck which is at fault. The Earth is quite often the problem which is the white cable. Try and join this with a wire to a known good earth point on the vehicle and it may cure it. Otherwise, the RH indicator is the Green cable which may have a short circuit. Problems usually occur at termination points such as plugs of earth bonding points.

I should caveat that I grind tree stumps, but I also have a HND in electronic engineering!

SG

[aspenarb]

Along the same lines, these cheap draper testers are good because the lead will reach the drivers seat . Handy for testing sockets if you are on your own.

 

Bob

 

[Badgerland]

Thanks for the suggestions guys. I'll have another look in the morning and see what I can find. (or should I have said unearth?)

[Badgerland]

Earth would maybe affect all lights, maybe a chaffed indicator wire to socket earthing out.

What happens when hazards are put on.

Same thing happens with the hazards as the indicators. As soon as I plug in trailer lights I lose the indicators and hazards on the truck. Unplug it and all returns to normal.

[woody paul]

Same thing happens with the hazards as the indicators. As soon as I plug in trailer lights I lose the indicators and hazards on the truck. Unplug it and all returns to normal.

 

Right hand indicator is along side earth in socket maybe some corrosion bridging the two.

[Stumpy Grinder]

Same thing happens with the hazards as the indicators. As soon as I plug in trailer lights I lose the indicators and hazards on the truck. Unplug it and all returns to normal.

 

Ah, that's a bit more useful information! Your vehicle should have an audible relay which 'beeps' with your indicators/hazard lights and is common to both with a trailer fitted. Check that for open cct or broken wires. Short cct's normally blow fuses!

SG

[woody woodpecker]

weak flasher unit on truck ,does you mates trailer lights work when pluged into his own truck ? if they do then its your truck and not a trailer problem. cheers chris

[Deafhead]

Hi have the same trouble (Also L200/Ifor Williams)although mine is the rear fog playing tricks.Caused apparently by a faulty relay.