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Thread: Vectra C towbar electrics/Relay wiring

  1. #1
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    Thumbs up Vectra C towbar electrics/Relay wiring

    Hi, i'm new to this site so bare with me!!

    I have a 57 plate Vectra SRi, I have fitted an A1 towbar and I'm about to tackle the electrics!!??

    I have a 7 way by-pass relay, so from what i've read I shouldn't need it Tech-2'd. I have the wiring diagram for the relay but can't find a service manual or wiring diagram for the electrics for the lights.

    I have the twin 12N and 12S connectors, but can anyone help me with the electrics for the wiring in the car for the lights on the trailer (12S would be a bonus too but I bought the whole thing as a package and both connectors were included)

    Many thanks in advance!!
    Darryl.

  2. #2
    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

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    The main problem with the N socket is how the vehicle tail and stop lights operate.

    The Vectra operates the tail light bulbs at reduced voltage and then operates the same bulbs at full 12V for the stop light.

    This confuses the wiring.

    Also, there is a bulb failure detection which further complicates matters.

    I wired my electrics up by using the number plate lights for tail (they operate at full 12V all the time) and using the high level centre stop light for the towbar stop light. The indicators can be simply connected to the rear of each side light cluster wiring without issue.

    The feeds for the tail and stop then operate a relay each for the main towbar wiring. Power for these relays came from the rear fuse box, the next fuse slot to the large 40A orange fuse that is fitted.

    The feeds from number plate and high level centre stop light also came from the rear fuse box, through tracing and testing the wires.


    I haven't wired up my S socket, and probably will never do it, as I don't need it.

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    Thanks for the update and advice Steve, I will have a look tonight and do some tests with my multi-meter.

    Do you know of anywhere that I can get the circuit diagram to identify the cables and cable colurs?

    Thanks again!

  4. #4
    [Ex]Admin Duncan's Avatar
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    The easiest, but not the cheapest, way of doing the wiring would be to use the Vx trailer module that simply plugs into the Rear Electrical Centre (REC). Then all the wiring is sorted, and you can have 12S as well. It's dead easy to do - it's what is on my removable towbar - and I also have 12S as well on the same wiring.

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

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    Yes, indeed that method is the easiest from a standing start. But as he already has the wiring and relay, it may be quicker to attach that instead.

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    [Ex]Admin Duncan's Avatar
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    True, although it may still be less faff just to ditch the wiring that he's got and go with the Vx one - especially if he's having trouble sussing out what's what.

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    Ex-Staff Full Member John LE's Avatar
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    Vehicle : Facelift Insignia/Corsa D

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    Just a pointer that if the genuine VX electrics are used the car may need to be tech2'd

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    [Ex]Admin Duncan's Avatar
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    They shouldn't need to, given what people have said. When I fitted it in mine it just plugged in and worked. Although there's obviously always the chance that on occasions someone will need theirs to be Tech 2d when they fit it!

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    Thanks for the replies, when I spoke to Vx they said that it would need to be Tech 2'd Then again they would, because they quoted me £75 per hour and said it would take 2 hours to fit the cabling and Tech 2 it...there would also be a £56 charge for the cable, didn't want to ask if this included VAT!!!

    Going off Ste's advice, as I already have the relay (its apparently on its way with Royal Mail!) I will take a look at the cabling tonight and have a go at fitting the relay first. Thanks.

  10. #10
    Regular Member Smirnoff's Avatar
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    Quote Originally Posted by Ste View Post
    The main problem with the N socket is how the vehicle tail and stop lights operate.

    The Vectra operates the tail light bulbs at reduced voltage and then operates the same bulbs at full 12V for the stop light.

    This confuses the wiring.

    Also, there is a bulb failure detection which further complicates matters.

    I wired my electrics up by using the number plate lights for tail (they operate at full 12V all the time) and using the high level centre stop light for the towbar stop light. The indicators can be simply connected to the rear of each side light cluster wiring without issue.

    The feeds for the tail and stop then operate a relay each for the main towbar wiring. Power for these relays came from the rear fuse box, the next fuse slot to the large 40A orange fuse that is fitted.

    The feeds from number plate and high level centre stop light also came from the rear fuse box, through tracing and testing the wires.


    I haven't wired up my S socket, and probably will never do it, as I don't need it.
    I take it that this is why my front sidelights on the van light up when I brake?

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