Battery or Alternator?
08-01-2012, 10:11 PM
#1
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Year: 1994
Model: Cherokee
Engine: Inline 6 4.0L High Output
Battery or Alternator?
Ok so im having a problem with low voltage in my jeep... this started best i can remember when i changed my oil and battery terminals (2 weeks ago). Anyhow, it will start up and run and then each time i restart it it seems weaker and weaker... jeep off key off i got 12. 8 something volts on my multimeter from the battery. Headlights on jeep off key off i got 10. something volts from battery. Jeep running in got 13-14 ish volts on the battery. Disconnected the positive terminal from the battery and put the multimeter on 10 amps and measured with the positive lead on the disco'd terminal and the neg lead on the positive battery terminal and got -.08... 2 days ago i got .86 or close enough by doing that. Its on the battery charger for the night because something is draining my battery but i dont know what... any ideas as to what this could be? Alt not working sometimes or what?
08-01-2012, 10:40 PM
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Year: 88
Model: Cherokee
Engine: i6 4.0
Originally Posted by 94XjSport94
so if its good it'll keep running? i'll hit on it tomorrow too...
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08-01-2012, 10:41 PM
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Year: 88
Model: Cherokee
Engine: i6 4.0
Originally Posted by anothadayridin
Yes. Sir it will stay running if alts good
08-01-2012, 10:50 PM
#11
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Year: 1994
Model: Cherokee
Engine: Inline 6 4.0L High Output
Not really so i wouldnt expect there to be mud or anything up there and it looked pretty clean... Idk
08-01-2012, 10:52 PM
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Year: 88
Model: Cherokee
Engine: i6 4.0
Originally Posted by 94XjSport94
Not really so i wouldnt expect there to be mud or anything up there and it looked pretty clean... Idk
08-02-2012, 09:40 AM
#13
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Year: 1994
Model: Cherokee
Engine: Inline 6 4.0L High Output
Tested the voltage this morning... 13. something on the battery, slow to crank but did then i pulled the terminal off so im guessing the alt is good... Something has to be drainging the battery though... idk what though cause when i measure the amps between the terminal and the post it was still ~.08...
08-02-2012, 10:13 AM
#14
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Year: 1993
Model: Cherokee
Engine: 4.0l
The terminal test isn't foolproof for the alternator, best thing would be to get it tested, most part stores do it for free. Also if they have a tester that actually uses an amp clamp probe they can tell you if there is a draw on the system with everything off to at least give you a starting point.
08-02-2012, 10:22 AM
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Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
How old is the battery? Load test it and see if it drop bellow 9.6 volts with a 200 amp load on it.