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Old 11-18-2015, 11:16 AM
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Voltage regulator failed.

Went to start the Jeep this morning and long behold it didn't want to turn over. Kept ticking at me. Had enough power for the stereo and dome lights. Got her jumped and headed over to old trusty auto zone.

Battery was at about 60% charge but my voltage regulator read as failed.

Figure that means I'm in need of a new alternator.

Now before I go jumping the gun on that could there be anything else causing the issue?

Also, if this is the route i should take. Any suggestions on new alternators would be appreciated. Rather i stay with stock or get an aftermarket one.

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Old 11-18-2015, 11:20 AM   #2
Knows a couple things...

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The voltage regulator is physically located inside the ECM (engine computer) module, it's not in the alternator. I'd go to a battery shop (not Autozone!!) and have them perform a load test on the battery to get a better idea of the battery's true health. It's not likely anyone in Autozone knows how to do a "good" load test on a battery. If not done correctly (which means without enough of a load or for long enough), a battery test will fool you into thinking the battery is ok when it's not.

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Old 11-18-2015, 11:30 AM   #3
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First check wiring as if it is really the regulator you only have two options

Convert to stand alone voltage regulator or replace the PCM
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Old 11-18-2015, 11:30 AM
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I'll be sure to get that done, very helpful information. Appreciate it. The guy at autozone only did the test for maybe a minute or 2 at best.
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Old 11-21-2015, 04:52 AM
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Well went in today for a recall and had them check everything out. Alternator was putting out 60 amps and says battery is at 292 CCA not sure what that means exactly but said to get new battery. Had them charge up battery so that i could get it home or to buy a new one. Battery tested good so retested with it fully charged and voltage regulator came up as failed again.
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Old 11-21-2015, 09:44 AM   #6
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I always thought the difference between a generator and an alternator was that the generator required an external voltage regulator while an alternator had the voltage regulator built in. Now the voltage regulator is part of the ECM? I'll have to inspect the wiring a little closer next time I am under the hood.
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Old 11-21-2015, 11:45 AM   #7
Knows a couple things...

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A generator produces DC while an alternator produces AC which then requires rectifiers/diodes to turn it back into DC. The voltage regulator can be anywhere... inside, external, or inside the ECM where the TJ's is.

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