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Key is stuck in ignition, no power to any dash or any lights

Tiny
GLENN OABAGA
  • MEMBER
  • 2004 ISUZU ASCENDER
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
I changed the 125 amp battery fuse, it starts, then the next day, the same problem again.
Sunday, February 11th, 2018 AT 9:06 PM

7 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
Are you saying the 125-amp fuse blows intermittently? That fuse feeds the rear fuse box. That fuse box handles over a dozen circuits, but they all are protected by their own smaller fuses. The largest are a few 30-amp fuses. Anything shorted in one of those circuits would blow its own dedicated fuse. The only thing that can blow the 125-amp fuse is the red wire feeding that fuse box has to be shorted to ground. Typical suspects would be the wire is in a harness that has been sliding back and forth against sheet metal when the engine rocks or the body vibrates, or the wire became pinched under something like a running board bracket, and things like that.
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Monday, February 12th, 2018 AT 12:15 AM
Tiny
GLENN OABAGA
  • MEMBER
  • 4 POSTS
I checked the fuse with my multi-meter and has continuity, also checked all the other fuses and they all checked out good.
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Monday, February 12th, 2018 AT 12:56 AM
Tiny
CARADIODOC
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Why did you need to replace that fuse?
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Monday, February 12th, 2018 AT 1:54 AM
Tiny
GLENN OABAGA
  • MEMBER
  • 4 POSTS
Since the key was stuck and no power that was all I could think of. It help me get the car running to get it home. Then the next morning back to square one.
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Monday, February 12th, 2018 AT 2:40 AM
Tiny
CARADIODOC
  • MECHANIC
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I am still not clear on whether that fuse blew. Sometimes computers can be reset by disconnecting the negative battery cable for a minute. Removing the fuse can do that too, but replacing the fuse because it blew vs. Removing and reinstalling it are totally different symptoms.

What does "square one" mean? Is that where the dash and lights were out? If so, we will need a voltmeter to take some measurements.
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Monday, February 12th, 2018 AT 3:25 AM
Tiny
GLENN OABAGA
  • MEMBER
  • 4 POSTS
Yes, the key is stuck and there is no power on the dash or any lights. I checked the battery voltage and it reads 12.63.
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Monday, February 12th, 2018 AT 10:12 AM
Tiny
CARADIODOC
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Why did you remove that fuse? Is doing that what got everything working one time or was that fuse blown?
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Tuesday, February 13th, 2018 AT 6:43 PM

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