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Unread 03-03-2014, 03:40 PM   #1
Mambo_Dave
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1991 YJ Wrangler 
 
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Code 41, but... everything seems normal.

Check Engine light came on today. Code 41, but I already have a digital voltmeter hooked up to the Jeep. 14 to 14.1 Volts running, down to 13.4 to 13.6 V with the lights on.

Battery is 2 months old, reading 12.6 on the voltmeter with ignition on but not started.

Check Engine light takes a few minutes to come on after starting it each time.

Any suggestions, or should I just change the alternator brushes anyway?

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Unread 03-03-2014, 03:53 PM   #2
Louie4
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I've had alternators work intermittently and lucky me they work when I have it tested and then I find out the hard way it's bad.

Maybe have the alternator tested again but have them run it for a minute and test it several times.
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Unread 03-03-2014, 04:39 PM   #3
cjapgar
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Same thing happened to me today. In cab meter dropped to 12.5ish and the check light came on 10 mi from the office. On the way home stopped to get it tested and the store says bad alt. then starts pumping 14+ again on and off since then.
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Unread 03-04-2014, 06:09 AM   #4
Que89YJ
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Hey Mambo. It sounds like your output is low. It should stay above 14 running, even with the lights on. It sounds like you have a diode going in the alternator.
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Unread 03-04-2014, 08:39 AM   #5
Mambo_Dave
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Quote:
Originally Posted by Que89YJ View Post
Hey Mambo. It sounds like your output is low. It should stay above 14 running, even with the lights on. It sounds like you have a diode going in the alternator.
Thanks.
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Unread 03-04-2014, 08:52 AM   #6
Mambo_Dave
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I'll try to take a look at it THursday
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Unread 03-04-2014, 09:06 AM   #7
Que89YJ
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Consider bolting on the grand cherokee alternator. Might be a good time to upgrade. 1 more theng. Check both 50 amp fuses in the PDC.
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Unread 03-04-2014, 02:45 PM   #8
Mambo_Dave
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Quote:
Originally Posted by Que89YJ View Post
Consider bolting on the grand cherokee alternator. Might be a good time to upgrade. 1 more theng. Check both 50 amp fuses in the PDC.
I noticed when looking at alternator rebuild kits that there was a 75 amp and a 90 amp alternaotr that could have been put in these things.

Does anyone have a specigfic part number for the Cherokee alternator that would fit? What year Cherokee are we talking here - same years?
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Unread 03-04-2014, 05:05 PM   #9
Mambo_Dave
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Update:

Went to hook a Honda battery tester that we have here at work (tests the battery temp, load tests it I guess, other things)... but then foudn that the negative battery terminal was loose.

Made it tighter... gonna guess / test that that was the problem.
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Unread 03-05-2014, 05:20 AM   #10
Louie4
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Quote:
Originally Posted by Mambo_Dave View Post
Update:

Went to hook a Honda battery tester that we have here at work (tests the battery temp, load tests it I guess, other things)... but then foudn that the negative battery terminal was loose.

Made it tighter... gonna guess / test that that was the problem.
It's easy to look over the simple stuff. I'm going to go on a limb and say that is your issue.
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