All the van external lights work ok, only when my side lights are on and i operate either flasher, all 4 side lights blink in unison-----i have removed all lights, cleaned earth points and bulbs, checked plug sockets, all clean, ran a heavier test earth from car, but still have the problem----any electrical boffins out there?
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You seem to have done all the right things, Rob, Obviously there is some electrical connection being made between the indicator and lighting circuits.
Assuming that all has worked well in the past I still think the most likely place for a wire to become loose is in either the plug or socket. Do you have a friend with a caravan or lighting board you can hitch up to ? If all works with another van then the fault must be on yours : otherwise it is on your car.
I made up a simple test rig for the caravan lights I fixed a black socket to a board and screwed 7 brass screws in a line each one was connected to the plug with the correct colour wire and labeled I made up a lead with a plug at one end to fit lighter sockets and the other end I put 2 crocodile clips all I do now is plug the caravan lights into the socket on the board plug the lead in and using the crocodile clips to test each light circuit you can even simulate bad earth problems I think it cost me £4 for the bits and half an hour putting it together
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I had a similar problem, lights went dim with the side lights on. I ended up checking and cleaning all the connections.
Last month went away only to find side lights went dim again, keeping the side lights off the brake and indicators were okay. On further investigation when back home the car plug (I have a 13 pin on mine and use a 13 to 7 adapter in use) was found to have moisture/water in it. Where did it come from? Well before our trip I went through the car wash, whoever made up the plug instead of going through the rubber grommet just slit the side and put the cable in from there, that's how the water got in, by the way it's been on over 30 months!
It is nearly always a bad earth, especially on caravans.
See if the indicators on the caravan have their own separate earth cable, and try and find where that runs to. In a combination light cluster there should be a common earthing point.
The indicators are the ones with the faulty earth by the description, they are getting their earth through the combined filaments of the side light bulbs, and as they are a lower resistance than the sidelight bulbs, the side light bulbs will light up. (2 X 21W against 4 X 6W)
Some combination light holders use steel chassis that have poor connections.
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many moons ago i had a bad earth/negitive fault and turned out after many hours to be a bulb.just changed the bulb and it went away.possibly damp as the light although working the glass was loose in the metal base.many faults are caused by water ingress into the rear lights.i once spotted one half full of water.
Post last edited on 14/05/2012 17:26:51
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I would replace the plug and socket as a precaution. I normally change mine every couple of years as after that period I find I have to start jiggling the plug about when I fit it to get all the lights to work. Also check the right bulbs are fitted, I have lost count of the number of times I have seen faulty lights on cars because someone has forced a single filament bulb in place of a dual filament or vice versa.