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Author Topic: deactivation of rear fog lights when towing  (Read 293 times)

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robson

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deactivation of rear fog lights when towing
« on: 09 October 2017, 20:02:07 »

Does anybody know how this is achieved ie a relay in the car, a relay in the tow bar electrics. since my last towing trip I have lost both my rear fog lights and my reversing lights when not towing .Help please :y
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Andy B

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Re: deactivation of rear fog lights when towing
« Reply #1 on: 09 October 2017, 21:50:32 »

Really is dependant on the spark that wired your car. The OE 12N socket has a small switching the side if the socket that the 12N plug switches to turn the car's rear fog off. But there are various options with relays to turn a car's rear fog & reverse light off when towing.
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Andy B

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robson

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Re: deactivation of rear fog lights when towing
« Reply #3 on: 09 October 2017, 22:45:54 »

 Thanks for the help .I have a 30a Auto switch combi relay TEC3M in my wiring in the boot  When I checked this the wire going to the 12 volt connection was not connected I connected this up, a green wire, but nothing changed.Do you think that the relay is faulty.would this affect the rear fogs and the reversing lights. Relay connections are 12v 12v 6 4 2 Ov wires are green red green blue black in same order.
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robson

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Re: deactivation of rear fog lights when towing
« Reply #4 on: 09 October 2017, 23:03:02 »

just been out in the dark to check lights and having read a post on failed wiring on the boot hinge checked this and sure enough found a fault by wiggling the cable. so rear fogs sorted now have to sort the reversing lights.
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robson

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Re: deactivation of rear fog lights when towing
« Reply #5 on: 09 October 2017, 23:07:54 »

Do the reversing lights wires also come down the boot hinge?
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Andy B

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Re: deactivation of rear fog lights when towing
« Reply #6 on: 09 October 2017, 23:38:06 »

Do the reversing lights wires also come down the boot hinge?

I think they do.  I didn't use any fancy electrickery on my Omega, just used the mechanical additional switch in the socket with a OE 12N then OE 13 pin socket which just switched fogs off.
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robson

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Re: deactivation of rear fog lights when towing
« Reply #7 on: 10 October 2017, 13:52:39 »

Sorted the reverse and rear fog lights out.It was a broken wire on the boot hinge.the interesting point was that the fog indicator came on when reverse was selected auto but no working fog.Whilst trying to diagnose the problem I was checking fuses and now my headlamp main beam indicator on the instrument display has gone. any idea which fuse controls this?
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robson

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Re: deactivation of rear fog lights when towing
« Reply #8 on: 10 October 2017, 19:26:11 »

Looks like fuse 21 10amp got it all sorted now. :y
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Andy B

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Re: deactivation of rear fog lights when towing
« Reply #9 on: 10 October 2017, 21:45:28 »

Glad you have sorted it ..... sounds to be simple, no cost fixes  :y
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robson

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Re: deactivation of rear fog lights when towing
« Reply #10 on: 11 October 2017, 21:13:25 »

Yes all this down to a broken wire on the boot hinge what a stupid place to run these wires.
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Re: deactivation of rear fog lights when towing
« Reply #11 on: 12 October 2017, 21:47:56 »

Yes all this down to a broken wire on the boot hinge what a stupid place to run these wires.
Preferably to across the boot aperture  ::)
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Nick W

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Re: deactivation of rear fog lights when towing
« Reply #12 on: 12 October 2017, 23:09:10 »

Yes all this down to a broken wire on the boot hinge what a stupid place to run these wires.


How else would you power stuff fitted to the bootlid? Especially if you need it to work if the lid is open.
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