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  1. #1
    volvo1980's Avatar
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    Towbar wiring advice

    Well I have finally got a detachable towbar off eBay for my 2001 avant but I am just after a but of wiring advice, does anybody have a wiring diagram for single electrics and do I need a bypass relay? The guy I have bought the towbar off stated that he didn't need a relay but that was a pre facelift car.

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  3. #2
    mattpanton's Avatar
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    I fitted a towbar to my 2001 avant last year, I used a full bypass jobbie as I was a little concerned about the towbar wiring setting off bulb failure warnings on the tail/brake light circuits. As for a wiring diagram all I did was tapped into the wiring coming off the back of the lights clusters, using the location of the bulb as reference. I can have a look tomorrow at what is wired where if it would help?
    2001 A4 Avant SE 1.9TDi

  4. #3
    volvo1980's Avatar
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    Quote Originally Posted by mattpanton View Post
    I fitted a towbar to my 2001 avant last year, I used a full bypass jobbie as I was a little concerned about the towbar wiring setting off bulb failure warnings on the tail/brake light circuits. As for a wiring diagram all I did was tapped into the wiring coming off the back of the lights clusters, using the location of the bulb as reference. I can have a look tomorrow at what is wired where if it would help?
    I have found some info and because they have canbus from 2000 so apparently I need a bypass relay, should be ok with the wiring, where did you take your constant live from for the relay? Thinking of taking it from the power socket in the boot.

  5. #4
    "Stick a V8 in it!"

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    "Canbus" has nothing to do with the lighting.

    All B5's have bulb monitoring, and it doesnt use canbus on any of them.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
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  6. #5
    mattpanton's Avatar
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    I took my constant live from the boot power socket, did wonder if the circuit was up to running trailer lights but i've not blown the fuse yet so seems fine
    2001 A4 Avant SE 1.9TDi

  7. #6
    "Stick a V8 in it!"

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    Boot power feed can deliver 10A, which is ~120w of lighting. Even with both brake lights, fog light, reversing light and side lights on thats only about 100w

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  8. #7
    mattpanton's Avatar
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    I never bothered to calculate it out, I worked on the priciple that if the fuse remained with as many lights on the trailer as possible then it would be ok!
    2001 A4 Avant SE 1.9TDi

  9. #8
    OldRedEyes's Avatar
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    I used a relay, and took the power from the boot light.
    As for connecting to the correct wire for the trailer lights, i soldered and extension cable to the back of the lights so that i didn't have to cut into the loom. DON'T use those crap clips that cut through the outer sheath to make the connection, they are crap.

  10. #9
    volvo1980's Avatar
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    Thanks for all the advice and I should be fine now, anything has got to be easier than fitting coilovers to a 10 year old car as I found out on Friday! Just ordered a 7 way bypass relay so should be ready to fit next weekend.

  11. #10
    mattpanton's Avatar
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    Quote Originally Posted by OldRedEyes View Post
    I used a relay, and took the power from the boot light.
    As for connecting to the correct wire for the trailer lights, i soldered and extension cable to the back of the lights so that i didn't have to cut into the loom. DON'T use those crap clips that cut through the outer sheath to make the connection, they are crap.
    I second that. Solder and heat shrink tubing is your friend
    2001 A4 Avant SE 1.9TDi

  12. #11
    foursprungdugtechnique's Avatar
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    I got a Westfalia detatchable towbar fitted on my 2000 B5 last year.
    Power was from the boot power socket, got 13 pin socket fitted as it is the new standard for caravans, split charge relay, and bypass relays fitted, all wires soldered and shrink wrapped, perfect job.
    As previously mentioned DONT use the Scotch locks for connecting the wires, they are crap, and you will get a bag of them with the wiring. They would be as well flogging you a cheap soldering iron, at least it wouldnt get wasted

 

 

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