XJ6 & XJ12 Series I, II & III 1968-1992

Help with fuse issue?

 
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Old 05-29-2016, 06:19 PM
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Default Help with fuse issue?

My 76 xj12 keeps blowing fuse #3. This is a 35amp fuse that powers most of the interior accessories. What could be wrong? Where to start?
 
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Old 05-29-2016, 06:33 PM
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Does a new fuse blow *instantly* ?

Is there one particular accessory that always blows the fuse? Or combination of accessories?

Do you have a wiring diagram?

One method is to determine exactly what's on that fuse and systematically start disconnecting sub-circuits until the fuse no long blows

Cheers
DD
 
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Old 05-29-2016, 06:40 PM
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Yes, the fuse blows instantly and yes I have a wiring diagram but to me it's useless as I am an electrical moron. Your suggestion on sub circuits make a lot of sense, that is where I will start.
 
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Old 05-29-2016, 06:44 PM
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Do you have a cigar lighter. Has something , like dime, dropped into it. I have known this to happen.

Roger
 
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Old 05-29-2016, 06:49 PM
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Nothing in the cigar socket, but it is crusty in there.
 
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Old 05-29-2016, 06:58 PM
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Originally Posted by Paulie63 View Post
Nothing in the cigar socket, but it is crusty in there.
That's an easy place to start. Unplug the lighter wires.

Cheers
DD
 
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Old 05-29-2016, 07:05 PM
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Does the fuse blow before you turn the ignition on.

Roger
 
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Old 05-29-2016, 07:08 PM
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The fuse does blow before the ignition is switched on.
 
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Old 05-29-2016, 07:18 PM
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In that case it has to be an item that is permanently powered.
Possibles are: Ignition Switch, Interior Lights, Clock, Door Locking, Hazard Switch, Light Switch, Footbrake light switch., Radio.
I do not have a diagram for your vehicle but if you can see the fuse on the diagram then follow the lines to the items that it powers.

Roger
 
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Old 05-29-2016, 07:23 PM
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I have a Haynes manual, is this a good choice or is there a better repair manual?
 
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Old 05-29-2016, 07:29 PM
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The Haynes should be Ok. I have the 86 XJ6 one so I admit it is pretty cluttered as everything is on one page. But you will need to persevere with it.

Roger
 
 
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