Fog lights

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Discodave1307

New Member
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4
Location
Charlton
Hello all My disco failed her mot Thursday one of the reasons was rear fog lamp not working? Tail light insufficient and brake light not working? Today I removed n/s rear light cluster and cleaned contacts and bulbs and replaced brake light bulb also checked fuse for fog which was blown so replaced brake/ tail light now works. Fog light worked but then noticed smoke coming from fuse box and fuse had melted not blown? Now I can not get fog to work at all? Any ideas as to why this happened and any remedies greatly appreciated!
 
I think you have two issues with your fogs, the first is there is a sort circuit somewhere between the light fitting and the switch, secondly, the fuse should have blown not melted. The fuse is probably a cheap Chinese replacement. There has been some reports of cheap fuses being wrongly rated and inadequate plastic mouldings.

Col
 
Colthebrummie said:
I think you have two issues with your fogs, the first is there is a sort circuit somewhere between the light fitting and the switch, secondly, the fuse should have blown not melted. The fuse is probably a cheap Chinese replacement. There has been some reports of cheap fuses being wrongly rated and inadequate plastic mouldings.

Col
Click to expand...
Colthebrummie said:
I think you have two issues with your fogs, the first is there is a sort circuit somewhere between the light fitting and the switch, secondly, the fuse should have blown not melted. The fuse is probably a cheap Chinese replacement. There has been some reports of cheap fuses being wrongly rated and inadequate plastic mouldings.

Col
Click to expand...
Hello thanks for the reply!
How would I go about finding the short circuit?
I think you could be right about the fuse as I couldn't believe it didn't blow and it was melting into the fuse board?
 
A visual inspection would be the first step. Look where the wires make a connection such as at the lamps, the switch and relay if there is one. If you can identify the wires, use a multimeter set to resistance and with the circuit switched off, put one probe on a live connection and the other to earth, if it reads zero ohms there is a short somewhere in that wire. A test lamp will do just as well. Tracing electrical faults can be frustrating, sometimes it's just quicker to replace the wiring. If the fuse melted, there is a chance that some of the wiring insulation has melted somewhere too, that might be visible but shorts normally occurs at connections, e.g. a spade terminal might detach itself and make contact with earth.

Col
 
Colthebrummie said:
A visual inspection would be the first step. Look where the wires make a connection such as at the lamps, the switch and relay if there is one. If you can identify the wires, use a multimeter set to resistance and with the circuit switched off, put one probe on a live connection and the other to earth, if it reads zero ohms there is a short somewhere in that wire. A test lamp will do just as well. Tracing electrical faults can be frustrating, sometimes it's just quicker to replace the wiring. If the fuse melted, there is a chance that some of the wiring insulation has melted somewhere too, that might be visible but shorts normally occurs at connections, e.g. a spade terminal might detach itself and make contact with earth.

Col
Click to expand...
Thanks very much! If all else fails is there no way I can maybe wire a seperate switch for the fogs??
 
Checking the wiring is definately easier if you have a circuit diagram. You can rewire the fogs but you will need to wire it through a relay. You need to know the watt rating of the bulbs to work out the fuse rating and cable diameter.

Col
 
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