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Towbar wiring diegram

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Old Oct 26th, 2011, 16:12   #1
DavidMartin
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Default Towbar wiring diegram

Hiya Guys,
Can anyone help i have just fitted a towbar to my 98 S40 but i didnt get a wiring diagram with it, I have looked all over the net and cant find one.

So if anyone has got any links or have fitted a towbar and still have the wiring diagram to hand could you let know what colour wires go where.

Thanks in advance
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Old Oct 26th, 2011, 17:15   #2
pphilpot
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Hi David - what are you looking for exactly? I'm guessing that you have fitted a relay and are looking which relay wires are for which lights... Correct?

If so, try this:

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Last edited by pphilpot; Oct 26th, 2011 at 17:23.
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Old Oct 26th, 2011, 18:12   #3
DavidMartin
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Hi pphilpot, Thats the relay i have and yep thats what i was after

Thank you pphilpot
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Old Oct 26th, 2011, 21:08   #4
sebaveh
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Towbar electric on s40/v40 , 1996 - 2004 can be routed directly from rear lights, no other drivers or interfaces are needed. Also you can find grey 4-pole connector with permanent supply, switched supply, ground and brake light, at the LH rear light. Don't forget to replace flasher relay with stronger one, and maybe route extra contact and wire from C2 terminal on flasher, to instrument cluster for trailer flasher control light.
One minor thing of OEM wiring harness is some relay in the middle, that cuts out the car's foglight, so that it lits only on trailer.
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Old Oct 26th, 2011, 21:34   #5
DavidMartin
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Very comfusing :/
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Old Oct 26th, 2011, 21:42   #6
DavidMartin
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Here are the two boxes i got with the towbar



I know now what the black box is for, But whats the other box for?
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Old Oct 27th, 2011, 00:13   #7
SteveTDCi
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Other box looks like a relay as well ?
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Old Oct 27th, 2011, 10:16   #8
pphilpot
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I've put a towbar on my previous '97 V40 and on my current '04 S40 - for both of them I just used the same black by-pass relay that you have. All the advice that I got was to use a by-pass relay.
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Old Oct 27th, 2011, 11:11   #9
DavidMartin
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Thats cool i will only use the black box relay then

Cheers again guys
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Old Oct 28th, 2011, 16:54   #10
DavidMartin
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Tryed wiring it in this afternoon, Do i need a live wire going to the relay?
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