100A fuse blowing 97 D90 - Defender Source
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  #1  
Old September 19th, 2011, 04:33 PM
terreneuve
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John
1997 D90
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Question 100A fuse blowing 97 D90

The truck starts and runs fine but no lights,signals, A/C or tach.

With the ignition off, when I disconnect the battery, then replace the 100A fuse, the fuse blows immediately when I re-connect the battery.

I know its a short somewhere but the problem started with only signals not working. I drove 100 miles home with no problems( other than signals) then parked for the night. Next morning truck still starts but no lights,signals, A/C or tach.

Any ideas where to start?

Thanks!
John
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  #2  
Old September 19th, 2011, 05:06 PM
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Antichrist
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Tom Rowe
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You could disconnect everything the the 100amp fuse feeds, then add things back one at a time, reconnecting the battery after each reconnect, until it blows again. Then you've found the culprit.
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  #3  
Old September 19th, 2011, 05:44 PM
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sonoronos
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Ed
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Blowing a 100 amp fuse without something lighting on fire implies to me that the short is somewhere very close to the 100 amp fuse.
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  #4  
Old September 19th, 2011, 07:24 PM
terreneuve
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John
1997 D90
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I can drive all day and battery is charging fine, wipers, brake & reverse lights work but nothing else not even the power windows work. No fires, burning smells - really strange problem!!

John
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  #5  
Old September 19th, 2011, 08:05 PM
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Jake K.
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Unplug the alt. from the backside of it and fire the truck up and turn on the things that were blowing the fuse before. Sounds like the alt is going wide open.
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  #6  
Old September 19th, 2011, 09:29 PM
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Tom Rowe
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Running the engine with the alternator disconnected from the battery can fry the diodes. Not a good thing to do.
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Tom Rowe
Atlanta, GA

Four wheel drive allows you to get stuck
in places even more inaccessible.

62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic
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