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Old 06-08-2009, 02:30 PM   #1
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Got a Tricky Alternator Question!!!

Alright fellas, got a trick Question here about the alternator! I put a new alternator in my 88 YJ with the I6 engine with no AC. It has 194K miles and needed a new alternator. Battery is fairly new also. Anyhow, here goes, put a new alternator in and it runs fine while idling. While revving up, from random time to time, the belt lets out a squeal and the voltage meters pegs out at the top end. After the squealing stops, it goes back down to it's regular middle of the road voltage @ 13 and does not squeal. I have watched it and it appears to be that the engine slows a tad and that causes the belt to wobble a tad while it squeals. What do yall think is the problem and what do I need to do to fix it?

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Old 06-08-2009, 03:42 PM   #2
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Sounds like the regulator in the alt is bad

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Old 06-08-2009, 06:08 PM   #3
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Bad alternator. You said new, but do you mean rebuilt. Sometimes you get a bad rebuild.
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Old 06-08-2009, 10:03 PM   #4
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I've bought brand new (not rebuilt) alts that were bad!
It's really a crap shoot, but now autozone & advance auto will test them for free.

Unbolt it & have then bench test it!
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Old 06-09-2009, 05:47 PM   #5
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maybe regulator. Alternator has main cable and one small wire which is field wire. that usually goes to battery warning lamp (dummy light) on dash. if disconnected the alternator goes full output. check that wire for breaks or loose connection. possible burnt bulb also.
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Old 06-10-2009, 10:10 AM   #6
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Definitely a rebuilt one purchased from Auto-Zone not too long ago. Will pull it and get it bench tested.

I got a question about the wire going to the dash. It's a gauge I am talking about, not a bulb. Help me out here
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Old 06-10-2009, 04:28 PM   #7
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Quote:
Originally Posted by popatop View Post
I got a question about the wire going to the dash. It's a gauge I am talking about, not a bulb. Help me out here
Not sure what the question is here, but if it's the usual one;
Guages not working - JeepForum.com




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Old 06-10-2009, 10:05 PM   #8
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Quote:
Originally Posted by popatop View Post
I got a question about the wire going to the dash. It's a gauge I am talking about, not a bulb. Help me out here
Heres the deal, Most older vehicles use the dummy light in the dash to energize the field windings. since jeeps have gauges and i dont have a wiring diagram all i can give is a general direction. My next advise to you would be to click the link Buckshot provided to check your gauges. If it is the gauge that energizes the windings you need to check connections at the gauge. also by now it should come as no surprise coming from me that i will advise to check battery cables both positive and negative for tightness and corrosion and also look at engine and body grounds. These yj's are getting up there in age where electrical is likely the next main concern after rust.

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