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Is the voltmeter needed?


AJamesR

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I have a 93 Explorer that was stripped down to use as an off road rig, but I'm not sure the guy knew what he was doing, The whole dash is gone and with it I'm sure some electrical components. It starts, runs, and drives great, so I don't imagine too many important things could have been removed.

My problem is it's not charging the battery now, when I first got it I put in a charged battery and with it running I was getting about 14.2 volts (12.2 not running) with my muti-meter. So I figured the charging system worked just fine. The next day I took it out on some trails and the voltmeter seemed to be where it should be when I first started out, but after the first gravel road I decided to disconnect the gage cluster as it was bouncing around a lot (no dash remember). Well by the time I got back it wouldn't restart, and even with a jump it would start and then die as soon as I took the jumper cables off, by this point the battery was at 10 volts running or not.

The Explorer is 40 min away and I can't go work on it at least until tomorrow, but I'm trying to get an idea of what could be wrong. Is it possible that disconnecting the gage cluster would stop the alternator from charging? or is there something else I should be looking for, I'll take the alternator in to get tested, but I doubt that's the trouble as it seemed to work perfect just the day before, and that would be too easy.
 


MAKG

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If you had an AMMETER, it could in principle disable the charging system to remove it (though most use shunts and will still function). But you have a voltmeter. It really shouldn't matter.

I suspect you shorted the connector to ground once removed, and cooked a fuse or fusible link in the charging circuit. A voltage drop test will isolate it if you can't see it easily with a visual.
 

AJamesR

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I'm not sure if it's an ammeter or voltmeter. But other then the one tiny 15amp fuse in the underhood relay box, what fuses/fusible links are in the charging system on a 93 explorer, I think I read there is a fuseable link near the starter?

also remind me what a "drop test" is testing?
 

High Desert Ranger

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The alternator has an idiot light in the dash. It's wired from the alternator to the light to 12v positive switched source, without it the alternator will not work. IIRC it is the "I" terminal on the alternator.
 

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