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Old 04-01-2009, 03:33 PM   #1
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voltage regulator location

I have a 1991 jeep wrangler and need help. I do not have the owners manual and I am trying to find out where the voltage regulator is located on this vehicle. Any help would be great!

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Old 04-01-2009, 04:55 PM   #2
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Sadly they are part of the alternator.

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Old 04-01-2009, 05:17 PM   #3
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^ Are you sure? I was told by my alternator guy that it is in the ECM. When I did my 350 swap I used the jeep alternator because it was new and 130 amps. My new optima battery was cooked. I'm not saying your wrong because I only know what he told me and it explains what happened.
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Old 04-01-2009, 05:35 PM   #4
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Depends on the year. I think in '92 or '93 it went external. I know TJ's regulators are in the ECM.
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Old 04-01-2009, 05:36 PM   #5
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^didn't know. Thanks for the clarification.
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Old 04-01-2009, 05:40 PM   #6
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My bad!!!

'91-'98 Wranglers were EXTERNALLY regulated... meaning in the ECM.
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Old 04-01-2009, 05:42 PM   #7
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Cool. Good to know. Ya my Chilton book says internal regulator. So I wired it up. That optima was boiling inside after a 10 minute drive.
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Old 04-01-2009, 05:45 PM   #8
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If you do want an internally regulated one, get one of these. They are Denso's. This was the confusing part, remembering which manufacturer they went with. Denso or Delco.
These are the same ones listed in those "write ups" you see on the web for 136amp alts.
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Old 04-01-2009, 05:45 PM   #9
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Altenator, voltage regulator???

Thanks for the reply. In regards to my first question. I'm showing 10 volts on my volt meter, but my altenator is putting out 14 volts, and my battery is fully charged, and I have a check engine light. I pulled the alt. and had it tested, its good. I put it all back together, fired it up, all good, 14 volts at the meter, and no check engine light. Shut the engine off to clean up, and when I fired it up again I get 10 volts on the meter and a check engine light. Any ideas?
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Old 04-01-2009, 05:50 PM   #10
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Sounds like it's doing it's job. The only other thing to test is the ECM... but I think only some shops or dealers can test them properly.
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Old 04-01-2009, 06:19 PM   #11
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Thanks, I guess thats the next step.

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