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Dome Light Fuse in a 2000 Isuzu NPR keeps blowing.

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If the dome light is the only circuit supplied by that fuse the sensible place to check for shorting wires is in the light fitting itself and if nothing is found work backwards to the fusebox.

Discovering where the short is on a single wire can be a massive task if it is in the wiring harness and it is often simpler to cut the offending wire at both ends and fit new, unfortunately it is unlikely the dome light is the only accessory supplied by that fuse. Referring to a wiring diagram before you start cutting should make things clearer - I hope it is something obvious in the dome light or accessible wiring...

Posted on May 14, 2017

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Posted on Jan 02, 2017

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1 Answer

My 2002 isuzu npr diesel f14 ign/ecu fuse blows about 20 seconds after starting. The glow plugs are on the circuit. It's not a direct short to ground. I'm can't find the right wiring schematic.


first off
no country stated
the books are indexed by
country
year 2002
isuzu NPR heavy truck
ask Isuzu for matching FSM book at your dealer.>
factory service manual.

shorts
remove all loads on the feed F14.
then add them 1 by 1 until it blows. bingo. last add is shorted
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join a read isuzu forum
or heavy truck?

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if not , looking bad, they can have tiny cracks.
i use a voltmeter , key on, and check voltage on both sides of the fuse for 12v. if that checks out, the fuse are good.
id bet one is blown , the one marked, CIG.
that is how fuses are marked in USA ! (your on a USA forum...)
but other countries, NOT.
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1 Answer

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bad wire or bad connector
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main 12v>>>>fuse >>>>> ignition switch>>>>brake switch>>> lamps. >>>>lamps to ground.

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its just a series circuit no more complex than a flash light.

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1 Answer

Dome light fuse keeps blowing


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