faulty lights

[Doug new]

Ducato Hymer 574 faulty rear lights.

The front and side lights all working ok,
The rear light cluster nothing working
At all.
Any suggestion

 

[davidbaldam]

Earth or fuse, hopefully someone will be along soon to help.

 

[PeteH]

First of All, What age (Year)?. Canbus on later ones are very finicky about EARTH`ing. Second is it just the Rear cluster at one side or both including the No Plate lights?. Fusing generally fails just one side (L or R) rarely both.?

Just a thought,? Have you recently reversed or driven over anything that could have caught the wiring in an exposed position and physically damaged it?.

Many years ago, I jacked a car and accidently cut the whole rear Loom!!. Ever laid on your back under a car in winter, with a soldering iron and some Tape?.

 

[Doug new]

Hi many thanks for the reply
The year of the Hymer is 2007, I have taken off the light units at the back of the camper Connected a earth connection their is a small voltage of 0.5 of a volt from all the plug in connecters and it is stable at this voltage, (ie) to flasher bulbs. The front flasher bulbs work ok but at a fast rate, head lamps fog Day time running lights, the lights that are both sides of the camper top and bottom all ok.

 

[jockaneezer]

Not sure of Hymers, but check and see if there is a central junction box under the chassis somewhere, these can get damaged/cracked and fill with water ?

^{_{Subscribers  do not see these advertisements}}

 

[PeteH]

2007? , will almost certainly be a canbus system, 0,5V? might? be the "signal" voltage?.

The way "canbus" works, (as was described to me by a Vauxhall Tech years ago) when I had issues with the Astra. The "signal" voltage only tells the unit which "lamp" to Ignite, the "power" voltage to the lamp is from a "main" type supply. If I am reading that correctly, It would mean that somewhere there is a fault in the "main" supply, Fracture or fused fail?.

Not really that helpful I know, but I suspect you need to get it checked at the OBD, to see what the faults are showing on the Management system.

 

[rosalan]

Rapid flashing of front lights only indicates there is a fault in the power supply to part of the unit.
Tracing back the loom can be very difficult but providing a good power supply to the rear, first, as you have already done with a good earth and secondly, a good lighting power supply, could enable you eliminate it being an earthing fault.