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MG MGF Technical - Blown Fuses

When trying to connect my protable sat nav system into the cigar lighter socket, the fuse continually blows. Have now repaced 5 x 10A fuses but each time I connect the sat nav the fuse blows.

I tried it with just the cigar lighter itself and the fuse still blows.

Any ideas please.
Clive

Check to see that the cig. lighter socket internals are not shorting out somehow.
Do any fuses blow when you plug in the original cig. lighter plug in?

Connect your sat nav sys directly to the battery (via an inline 10amp fuse and see if that fuse blows. If it does then your sat nav may have a short circuit in it.

Basically you need to diagnose it so that you isolate from where the fault is coming from.

Cheers,
Branko
Branko

Yes the fuse still blows when the original gig. lighter is plugged in.

The sat nav works perfectly ok when used in other vehicles.

So, I am pretty sure that the fault lies within the cig. lighter circuit somewhere.
Clive

Definitely sounds like a fault somewhere in the cigar lighter circuit Clive - although I can't think where?

Does the fuse fail as soon as it is put in?
Rob Bell

Rob

Yes, the fuse blows as soon as the cigar socket is used.

If the socket is not used, the fuse remains intact.
Clive

I hope that I am not the only one who is puzzled by this!
Rob Bell

Could be the socket shorting out, sometimes gets crud in it that could cause the short.

I'd suggest taking out the cigar lighter socket and pulling off the earth and live feed. Connect the sat nave to these two wires and see if this blows the fuse. If it does its in the wiring to the cigar ligher f not its the cigar ligher socket, so wizz to a scrap yard and take any similar socket. If its the wiring then I'd just run a new wire and forget trying to trace the fault, its only the cigar lighter after all.

There are loads of links to removing the cigar lighter, here's one

http://www.gregh.co.uk/html/cigar.htm

Brian
brian

This thread was discussed on 13/09/2005

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