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Subject Topic: Hot Wire In 12S Socket?? Post Reply Post New Topic
PersonGCMS2012
05/6/2016 at 2:38pm
 Location: Northumberland
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When we went away last weekend, I used a 12N / 12S to 13pin adapter for our caravan, so the fridge would be working while traveling.

(We don't have a battery to charge if you remember my other thread?)

On our Knaus, you have the choice of either plugging in the rear lights with a 12N plug only, or use a 13pin for everything...

On arrival to the site, I noticed the 12S socket was a bit hot. So going home I used only the 12N plug just for the rear lights....

This morning I've been out, stripped and checked both the adapter and the wiring in the rear of the socket on the car and found no loose wires, except for the white wire in the rear of the socket looked heat damaged and tainted in colour (the culprit), yet it was tight and had good connections.

Any other ideas what would cause the heat if there are no wiring problems etc?

Was thinking maybe the amount of current draw etc??



Post last edited on 05/06/2016 14:44:22

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PersonPickled Onion
05/6/2016 at 3:45pm
 Location: Near Alton Towers
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The heat damage seen on the wire may have come from loose pin/socket connections between the relavent 12 pin plug & socket. If the wiring is specifically for caravan use, the wires which draw more current should be thicker conductors.

Dave.

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Give a man a fish and he will eat for a day,
Teach a man to fish and you can get rid of him for a whole weekend.


PersonMike-Debbie
05/6/2016 at 4:14pm
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Was the white wire on pin three or seven. Pin three white van earth, pin seven black fridge earth


Personbirdman101
05/6/2016 at 4:18pm
 Location: Milton Keynes
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The white is the earth. The pin that usually is the one to overheat is the center pin which is the fridge earth and should be black.Have these two earths been wired correct way round.
Anther thing to check is if the pins were tight when connected.When I had these types of sockets and plugs I regularly used to get a small screwdriver and open up the pins in the cuts to keep them tight.


PersonLlaniDavis
05/6/2016 at 9:25pm
 Location: Llanidloes Powys
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Wire is not thick enough for the load, therefore has over heated.


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PersonGCMS2012
05/6/2016 at 9:37pm
 Location: Northumberland
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It was pin 3, the white one that had the damage.

Also, the truck already came with the two towing sockets fitted.

So should I check (test) to see which wire has the power to it - positive and negative etc and see just which way everything's flowing??

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Personbirdman101
06/6/2016 at 6:39am
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I would not of thought pin 3 would of got hot as it does not carry much load.Probably just a loose connection on that pin.Open up pin with a thin screwdriver in the two cuts so it pushes in tighter.It is normally the center pin gets hot if any as it is carrying a higher load for the fridge.


PersonJTQU
06/6/2016 at 9:01am
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I have in the past put this down to people wiggling the plug to release it rather than simply giving it a straight pull. Wiggling it loosens the pins inbuilt "springyness" so making a poorer contact and leading to overheating.


PersonGCMS2012
06/6/2016 at 8:55pm
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Did a quick test with a meter at work.

According to the meter, the white pin (pin 3) came in as a negative terminal.

So, next stop, open the pin a bit and see if it happens again.



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PersonTaylor56
08/6/2016 at 4:03pm
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We had to separate the earth connection on our old Terrano when we swapped vans as the 12s socket completely burnt out.Both earths for the fridge and the charging circuit were connected together on the car, I had been told that this could be the problem and put one earth to another point on the car and not had a problem since. We have changed cars but not had a problem with it.


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PersonGCMS2012
08/6/2016 at 7:26pm
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Taylor.....

I wonder if that could be another possibility...?

Two earths into one point...?

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Personchrisn7
09/6/2016 at 12:28am
 Location: West Yorkshire
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The white pin3 is the earth for the road lights *only*.

This , and the earth from pins 11 and 13 must not be connected in any way on the van side, but should each pass separately through their respective pins to an earth point in the car.

The wire gauge for pins 11 and 13 is heavier that that for pin3, so if pin3 wire is overheating it suggests that it is acting as an earth for one of the other two i.e. wired incorrectly, assuming the connections are otherwise sound


PersonGCMS2012
09/6/2016 at 6:20pm
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We used an adapter Chris.

My Shogun has separate 12N and 12S sockets. and the van has a 12N (road light only plug)...

And another plug, a 13 pin plug for everything.

It was the white wire on 'my side' of the 12S socket when I used the adapter to the 13 pin plug that got hot.

Guess I'll have to pull apart the rear of the Shogun to find where everything's been wired into...

-------------
Damned if I do...

Damned if I don't!!!!



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