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Thread: Rear 12v Socket wiring short circuit

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  1. Rear 12v Socket wiring short circuit 
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    Hi all, new to this, have done a search but cant seem to find anything. I have a MK7 golf with a short circuit on the rear 12v socket (cigarette lighter). Ive removed it and checked the lighter socket and thats fine so the short is in the wiring (checked with a multimeter)

    My question is how far does the wiring go, is it all the way back to the fuse box or does it piggyback off the one in the centre console and how can I at least isolate the rear socket so I can use the front one, they run off the same fuse

    I'm guessing I'm going to have to run new wires back to something to overcome the short so need to see where I can disconnect the rear socket to get rid of the short circuit

    Thanks in anticipation
     
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  2. Re: Rear 12v Socket wiring short circuit 
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    I'm not sure how you worked out that the short is in the rear socket. As you say, it is shared wiring to the front and rear sockets. If unplugging rear socket from the wires hasn't fixed it then the short is either in the wiring, or in the front socket. So have you tested across the red+black and brown wires with both sockets unplugged, and fuse 42(?)pulled?

    If it is still shorting I'd see if you get a meaningful resistance difference between the two wires with the -ve probe on the brown at each socket position in turn while the +ve probe is moved between fuse, cabin lighter and rear socket. That's 6 readings to see if you can see a pattern to work out which section the short is in.

    Remember the lighter feed is a prime one for 3rd party additions to be tapped into: radios, MMI additions, etc. That might be where the short is.
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  3. Re: Rear 12v Socket wiring short circuit 
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    Quote Originally Posted by VAG-Abound View Post
    I'm not sure how you worked out that the short is in the rear socket. As you say, it is shared wiring to the front and rear sockets. If unplugging rear socket from the wires hasn't fixed it then the short is either in the wiring, or in the front socket. So have you tested across the red+black and brown wires with both sockets unplugged, and fuse 42(?)pulled?

    If it is still shorting I'd see if you get a meaningful resistance difference between the two wires with the -ve probe on the brown at each socket position in turn while the +ve probe is moved between fuse, cabin lighter and rear socket. That's 6 readings to see if you can see a pattern to work out which section the short is in.

    Remember the lighter feed is a prime one for 3rd party additions to be tapped into: radios, MMI additions, etc. That might be where the short is.
    Many thanks for replying, I used a multimeter to check for a short circuit, the front one was fine, i.e with the multimeter set ohms there was no change to the reading, it stayed as 1, but the rear one showed that there was a circuit, the meter dropped to 0. The fuse blows as soon as it's inserted and the ignition is switched on.

    I hoped it was the socket itself and ordered the tool to remove it (got it from America in the end), removed the lighter socket and tested the connection itself and still the meter dropped to 0.

    I dropped the car off earlier to have a diagnostic on the heater, it blows cold intermittently so I suspect ive got the issue of the matrix being blocked, another fault i've found with the car which I bought at the end of May, but when its back I'll remove the front lighter and check the wiring with it removed and then check each section from the fuse box post the results back.

    Thanks again, I hadn't thought of checking across the components like that, suppose I hoped it was a faulty socket.
     
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  4. Re: Rear 12v Socket wiring short circuit 
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    Turns out that it was the front lighter socket that was faulty. I could only tell when the socket was out and I was able to test across the connections (which showed a short) rather than from the top and the positive pin to the negative body which wasn't showing a short. Goes to show that can far for no apparent reason!!
     
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