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Unread 11-30-2011, 01:58 PM   #1
wellmax
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1984 CJ7 
 
Join Date: Nov 2008
Location: Hazel, KY
Posts: 1,070
1984 alternator question

noticed today that the volt gauge was running at the top end of the green line. about 16 volts

turned on lights and it fell back to 12=14 volts.

the jeep had just been started and had not been started in about 1 week, so it could have been in a charging cycle.

should i have a worry or just drive it for awhile and keep my eye on the volt meter???

thanks,

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Unread 11-30-2011, 06:18 PM   #2
Mike Romain
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That can indicate a low battery just getting it's charge back up, but I find that when the gauge gets swingy, It is usually time to clean the ends of the battery cables. Don't forget the main cables have two ends eh, the other end is the one that bites you usually for a bad connection.

I also find if I polish up my fan belt the gauge can get swingy and kill the battery slowly. To test for that I take a cold off engine and see if I can hand slip the alternator pulley. If I can, it for sure won't hold under load and either needs tightening or replacing. A loose one usually makes noise, a polished one just slips. I killed 3+ belts a season when I used to mud run. Mud=liquid sandpaper.
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Unread 11-30-2011, 06:38 PM   #3
wellmax
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1984 CJ7 
 
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Thanks,
will check battery ends (both ends)
and check belt tension, may need a new belt as it has been on there for a good while.

Thanks again for the tips,
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Unread 11-30-2011, 06:40 PM   #4
86cj74.2L
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Quote:
Originally Posted by Mike Romain
That can indicate a low battery just getting it's charge back up, but I find that when the gauge gets swingy, It is usually time to clean the ends of the battery cables. Don't forget the main cables have two ends eh, the other end is the one that bites you usually for a bad connection.

I also find if I polish up my fan belt the gauge can get swingy and kill the battery slowly. To test for that I take a cold off engine and see if I can hand slip the alternator pulley. If I can, it for sure won't hold under load and either needs tightening or replacing. A loose one usually makes noise, a polished one just slips. I killed 3+ belts a season when I used to mud run. Mud=liquid sandpaper.
U ever make the alternator water wheel gizmo?
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