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Old 04-21-2009, 12:00 AM   #1
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Alternator Charging Issue

I am new to this forum as well as to the wrangler community. I am quite impressed by the amount of information that is shared on this site! I purchased my 93 wrangler back in december as a project jeep and have been tinkering with it and accumulating accessories for the past few months.

When I bought it I was told the alternator was bad - it had a new battery so I was able to drive it away and have only driven it a handful of times mainly through the ditches around my warehouse.

The voltage guage barely shows a reading so I assumed it was the alternator. Today I had it tested and to my surprise it is fine but the shop said its probably my computer. They said my voltage regulator is controlled by the computer but could be by-passed?

I have just begun to dig into this problem hence my searching out this forum. Is this a common problem among the YJ's? Has anyone by-passed their computer controlled regulator and would you recommend this as a solution?

Any advice is greatly appreciated!

In reading quite a few of the threads I can see the many requests for pics so I've attached one of my YJ as it currently sits. Stay tuned for future enhancements!
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Old 04-21-2009, 01:34 AM   #2
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Yeah my volt meter just stopped workin one day, but all the rest work fine, is it the gauge?

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Old 04-21-2009, 08:51 AM   #3
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Could be, have not tested it yet? Everything else works fine lights, dash etc. It does show a partial reading between 8-9 amps tho?
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Old 04-21-2009, 09:27 AM   #4
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Your gauge - a voltmeter or ammeter?
If a voltmeter and it's not showing much even with a fully charged battery, the gauge is on the fritz.

Engine stopped, put a voltmeter across the battery, note the voltage.

Start it up, note the voltage.

If it increases when running, the computer/regulator is fine, probably the gauge is defective.
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Old 04-21-2009, 03:16 PM   #5
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Check your battery leads to make sure they are in good shape still flexible not stiff and corroded. also is your battery connectors in good shape free of corrosion?
check to make sure the ground straps are in good shape going to the engine.
Might be something simple.
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Old 04-21-2009, 09:40 PM   #6
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Usually if your headlights aren't kinda dim at night, then the alternator is charging. Do check your grounds, & you should have on from the battery, to the block. Also one from the battery to the tub. I even like to run a ground strap from the block connection fro the battery, to the alternator case.


That said, most of the problems with the center gauge pod in a YJ can be permanently solved by following this procedure.

Guages not working - JeepForum.com

If you do it, you'll see what I mean if you start it up & move the connector a little. The gauges go nuts. This fix works, & you are welcome to bookmark it for other YJ'ers on this, or any other message boards!
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Old 04-21-2009, 10:13 PM   #7
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i had a similar problem in my 89 yj, but it turns out that all i needed was a new alternator belt.
common things occur commonly.
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Old 04-22-2009, 12:23 AM   #8
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True I gotta replace my belts anyways

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98% of people when they are about to go into the ditch say "oh shit!" The other 2% are Minnesotans and when we are about to go into a ditch we say "Hold my beer and watch this shit!"
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