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Author: Subject: towing electrics help
number-1

posted on 31/5/19 at 07:58 PM Reply With Quote
towing electrics help

I use a Renault Sport Megane 225 as my daily and also to tow a motorcycle to track days.

When the trailer isn't connected, all the lights work fine. However, when the trailer is attached and plugged in all is good too......until i turn the lights on. When i turn the lights on, the lights on the car and trailer come on but the brake lights on the car come on and stay on. The trailer brake lights do not unless i brake

Any ideas? Its got the Renault plug and play tow bar electric wiring fitted.

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rusty nuts

posted on 31/5/19 at 08:08 PM Reply With Quote
First thing I would check would be the 7 or 13 pin plug and socket for poor connections
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number-1

posted on 31/5/19 at 08:15 PM Reply With Quote
I've ruled out the trailer by buying a new trailer board and it still does it
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ReMan

posted on 31/5/19 at 10:04 PM Reply With Quote
Check the insides of the socket, car side. These are renowned for corrosion





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number-1

posted on 1/6/19 at 10:14 AM Reply With Quote
Cheers guys. I had a quick look car side for anything loose but nothing obvious. Its weird it doesn't do it unless the lights are on. I will have another look tomorrow.
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ReMan

posted on 1/6/19 at 10:51 AM Reply With Quote
Its an odd fault. Might it have always done this but you not noticed?
Are the lights on the car coming on definitely the brake lights not fog lights?





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Bigheppy

posted on 1/6/19 at 11:21 AM Reply With Quote
I had a problem with my fog lights on my car. After plugging my trailer in I noticed that the fog lights were not working on the car but worked fine on the trailer. When I unplugged the trailer and the fog lights still did not work.
After some advice I found that the trailer socket has a switch to turn off the fog lights when the trailer is connected (I had never noticed this in the two years I owned the car). After checking I found the switch had stuck. A bit of fiddling around soon had it free and working fine.
I realise its a different problem to yours but might be worth checking.

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rusty nuts

posted on 1/6/19 at 12:30 PM Reply With Quote
For what a 7 pin socket costs you might as well get a new one rather than trying to clean up your old one , I tend to smother the insides with connector protector
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ReMan

posted on 1/6/19 at 03:32 PM Reply With Quote
quote:
Originally posted by Bigheppy
I had a problem with my fog lights on my car. After plugging my trailer in I noticed that the fog lights were not working on the car but worked fine on the trailer. When I unplugged the trailer and the fog lights still did not work.
After some advice I found that the trailer socket has a switch to turn off the fog lights when the trailer is connected (I had never noticed this in the two years I owned the car). After checking I found the switch had stuck. A bit of fiddling around soon had it free and working fine.
I realise its a different problem to yours but might be worth checking.


Good call, again this could cause problems bependant on the fault and the tow car





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chillis

posted on 2/6/19 at 10:33 AM Reply With Quote
I've been having a similar problem with the Mondeo which has the Ford towing electric harness and modules. When the towing electrics are in circuit and the brakes are applied with the left hand indicator then the relay buzzer goes mad and the LH rear flasher doesn't flash, take the towing electrics out of circuit and its all fine.
Pin out between the towing electrics and the modules shows connectivity and no shorts to ground. Seems most likely its the modules. If you Renault has a similar system then I would be inclined to the the modules too might be the issue.





Never under estimate the ingenuity of an idiot!

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number-1

posted on 3/6/19 at 08:49 PM Reply With Quote
Cheers guys

I removed the bumper to find the loom had dropped and was resting on the tail pipe and melted a few wires so bare wires were present and grounding. I taped them up and the issue is corrected

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