Caravan 7- pin plug wiring.

Submitted: Friday, May 04, 2007 at 13:47
ThreadID: 45084 Views:18891 Replies:9 FollowUps:4
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Checking over the caravan tow plug and discovered that the wiring had all come loose. There were 10 wires to be wired into the 7 pin plug (caravan only 16mnths old). Before I seek help from a auto electrician does anyone know what wires go to which pin?
1.LEFT - YELLOW
2.REVERSE - BLACK
3.EARTH - WHITE
4.RIGHT - GREEN
5.ELECTRIC BRAKES - BLUE
6.STOP LIGHTS - RED
7.TAIL LAMP - BROWN
The extra wires were BLACK , RED AND BROWN. I can only presume that the black and red wires are for the emergency brakes and the brown wire I have no idea - Which wires would they join to? I thought they would just splice into the appropriate colour of the 7pin?? Any help appreciated.
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Reply By: Dave Thomson - Friday, May 04, 2007 at 14:00

Friday, May 04, 2007 at 14:00
Hi Yakodi,
save yourself a heap of grief and go to Repco they've got a trailer plug thats COLOUR CODED for $12.99 i'm not the brightest spark and I done it all by my little self in 20 mins good brilliant bloody great,
Dave
AnswerID: 237866

Reply By: yakodi - Friday, May 04, 2007 at 14:17

Friday, May 04, 2007 at 14:17
Going to repco doesn't really help - Which numbered pins do the remaining 3 wires connect to??
AnswerID: 237868

Follow Up By: bunny huntin - Friday, May 04, 2007 at 14:27

Friday, May 04, 2007 at 14:27
yeh repco wont help but yes the 7 wires are in the right spot you would think all you have to do is match up the 3 left over ones with the same colour but may be its worth ringing an auto elec and just asking or leave them disconected and see whats not working
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FollowupID: 498988

Reply By: SA_Patrol - Friday, May 04, 2007 at 14:31

Friday, May 04, 2007 at 14:31
If you've got a 7 pin plug I think only 7 wires will go in.

Sounds like you have 2 lots of red, black and brown,

Join the double wires together, the wires could come from side side of the van, add power to the red and brown and see what you get, otherwise ring the person where you brought the caravan from they should know.

AnswerID: 237873

Reply By: Stewy - Friday, May 04, 2007 at 14:38

Friday, May 04, 2007 at 14:38
There is no reverese on a van normally, how does the van get power from the car I suspect that the black and red are for that using the Reverse/Aux pin and earth and the brown may be relay so that the power from your vans' battery is cut from the plug when the car is not connected.
AnswerID: 237874

Reply By: Member - Doug T (W.A) - Friday, May 04, 2007 at 16:15

Friday, May 04, 2007 at 16:15
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AnswerID: 237895

Reply By: Member - Doug T (W.A) - Friday, May 04, 2007 at 16:19

Friday, May 04, 2007 at 16:19
Don't forget that one of the spares could be for the 12v to your interior van lights
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AnswerID: 237896

Reply By: Sea-Dog - Friday, May 04, 2007 at 16:21

Friday, May 04, 2007 at 16:21
Or electric brakes!
AnswerID: 237897

Reply By: yakodi - Friday, May 04, 2007 at 20:35

Friday, May 04, 2007 at 20:35
Thanks all will have another go this week. Or if all else fails call the auto elect.
AnswerID: 237945

Follow Up By: Steve from Top End Explorer Tours - Friday, May 04, 2007 at 20:58

Friday, May 04, 2007 at 20:58
Hey yakodi

I'm no auto elec but do you have lights on the side of your van?

If so the brown would be for them, as when you turn your light on these side light would come on with the tail lights,

Do you have 2 sets of stoplights?

This would account for the 2 red wires and the black one is for reverse so you don't need it so tape this one off.

Try that.

Cheers Steve.
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FollowupID: 499063

Reply By: Muzzgit [WA] - Friday, May 04, 2007 at 23:18

Friday, May 04, 2007 at 23:18
Here, get out of the way, let me try!

If all 7 pins are occupied, then apart from the basic stuff - tail lights/brake lights/indicators/earth...............
your 12v feed is taken care of,
your side marker lights are covered (these will be wired through the tail lights)
your trailer brakes (assuming you don't have hydraulics) are covered.

The caravan manufacturer will wire up so that only 7 wires come out at the front of the van. Any extras are spliced in or connected via a small bus bar somewhere inside or underneath.

I would assume that someone (the last owner) couldn't be bothered to "splice" into the wiring inside the van and has done a "bodgy" at the plug. If they are not trying to keep to the same colour code as normal trailer plugs, they may have thought that red is always positive, black is always earth, and brown is accessories (brakes) like 12v wiring on cars!!!! maybe perhaps i dunno i think ummm!!!

My suggestions..............
*another earth (should have been "spliced in" under the van)
*another 12v feed (should have been "spliced in" under the van or taken to a separate plug [anderson plug] if large load is required)
AnswerID: 237996

Follow Up By: yakodi - Saturday, May 05, 2007 at 07:15

Saturday, May 05, 2007 at 07:15
The anderson plug is no problem at all - all wired up as it should. We have had the van since new - so previous owner was the manufacturer, it just that all the wiring has come out of the pins in plug so needs redoing. There is an earth wired in. THAT sounds correct, the brown wire should be the side lights therefore should be wired into the tail lights. The red and black wires are the -ve and +ve for the emergency brake cutoff system and wired to appropriate colours. Cheers. And the electric brake controller - well thats another issue.....
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FollowupID: 499133

Follow Up By: SA_Patrol - Saturday, May 05, 2007 at 08:38

Saturday, May 05, 2007 at 08:38
Maybe you didn't read my post before you have a 7 pin trailer plug & connector correct , but you have 10 wires on the trailer side but you only have 7 wires on the car side.
You know the correct way to wire the plug on the caravan , the extra 3 wires Red, Brown and Black. correct ?

If you join the 2 red colours together and 2 browns together and 2 blacks together and stick them into the correct holes this should be right.

Your red and black wires for your emergency brakes go into your battery on your caravan. you only have blue from your car to your trailer for electric brakes. the emergency cut off for your brakes should be a separate wire attached to your car which goes into a special plug on your electric breakaway system. If this is not correct then the manufacturer has wired up his own way and an auto electrician can find out after an hour of labour.

A simple way is to attach neg wire (white) to neg side of battery and just arc out the extra red, brown wire.this will tell you that only one side parkers or brake light works . I'm not sure where the black wire goes my crystal ball is in for a service :-)
It would have to be 12v power into the caravan , unless you have reversing lights.

I'm sure the manufacturer can can tell you where the wires go just in case I'm wrong. I am a male and i have known to be wrong once before maybe twice but no more than that. :-)

I think I need a cuppa now
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FollowupID: 499142

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