Blowing fuses

[matty2305]

Hi can any body help ,i have a 1996 Discovery that keeps blowing the fuse that operates the front windows ,i have disconnected the switches but the fuse still blows, rear are both ok , any ideas would be appreciated

[nickgriff]

Hi, is the window stuck?? if the motor cannot turn the fuse will blow almost immediately.


Nick.

[NeilB]

Does the fuse blow when you operate the switch or as soon as you turn the ignition on?

If the fuse blows when you turn the ignition on then you have a 12v short to ground - check where the wires pass from the door to the body of the vehicle.

If the fuse blows when you press the button I would have thought it unlikely that the motor has stuck - the motor stops when the window gets to the top and that doesn't blow the fuse. I would check the cable going to the switch for lose insulation and places where it could rub on metal edges.

A multimeter will be your friend in this search......

[matty2305]

Hi all

i disconnected the motors that operates both front windows , but as soon as i replace the fuse it blows immediatly without the ignition being switched on, i will check the cable from the door to switch, not being very good with electrics how would i use a multimeter

tks for help

[NeilB]

A multimeter will save you fuses! Connect one end to the motor wire the other to the body, disconnect your battery, set the meter on resistance.
You should have lots of resistance, if you don't that is why the fuse is blowing. Now you can wiggle wires and disconnect connectors until the short goes away. when the short goes away you have disconnected or moved the wire that has the problem. You now have to find where the problem is in that wire.
It's not easy but with a logical approach you should be able to narrow down the search fairly quickly.

[buzz]

Hi all

i disconnected the motors that operates both front windows , but as soon as i replace the fuse it blows immediatly without the ignition being switched on, i will check the cable from the door to switch, not being very good with electrics how would i use a multimeter

tks for help


A multimeter usually has a function where by you can check continuity with a buzzer for simplicity. Basically connect one wire from the meter to the wire of the motor and the other to earth, one of the motor leads shoul "buzz" the other shouldn't.
The motor should have two wires to it, one to earth the other positive.

[matty2305]

Thanks to all, i will give it a go at the weekend ,