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Post by donsjeep on May 4, 2015 19:45:17 GMT -4
Looking to upgraded the alternator in my son's 2003 libby with a 3.7 litre engine. When winching the alternator can't keep up with demand.
Sent from my SGH-I747M using proboards
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Post by C Monster on May 4, 2015 21:04:38 GMT -4
you likely have a 132amp alternator now on it . that's way bigger than the 75 that came on my tj stock and if add a 160amp one, you will not see any gain Because the alternator on the libby is controlled by the PCM .You will need to have the PCM reprogrammed. For a bigger one. I think thats how it is.. maybe time to put a better battery in it or maybe dual batterys
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Post by donsjeep on May 4, 2015 21:13:50 GMT -4
you likely have a 132amp alternator now on it . that's way bigger than the 75 that came on my tj stock and if add a 160amp one, you will not see any gain Because the alternator on the libby is controlled by the PCM .You will need to have the PCM reprogrammed. For a bigger one. I think thats how it is.. maybe time to put a better battery in it or maybe dual batterys Yup. That might be what we have to do. Thanks Chris Sent from my SGH-I747M using proboards |
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Creepy
Administrator 
Dartmouth
Posts: 18,718
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Post by Creepy on May 5, 2015 16:52:26 GMT -4
Looking to upgraded the alternator in my son's 2003 libby with a 3.7 litre engine. When winching the alternator can't keep up with demand. Sent from my SGH-I747M using proboards that is a battery issue, not alt. You don't have enough reserve capacity. |
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Post by donsjeep on May 5, 2015 17:12:49 GMT -4
Looking to upgraded the alternator in my son's 2003 libby with a 3.7 litre engine. When winching the alternator can't keep up with demand. Sent from my SGH-I747M using proboards that is a battery issue, not alt. You don't have enough reserve capacity. So dual battery setup is the way to go it seems Sent from my SGH-I747M using proboards |
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The Garagemahal
Moderator 
Build Thread King
Resident Army Ranger , Navy Seal , Super-Warrior , Ninja !!
Posts: 11,518
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Post by The Garagemahal on May 5, 2015 21:02:21 GMT -4
Not even , a good , deep cycle is all you need
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Post by donsjeep on May 5, 2015 21:16:50 GMT -4
Not even , a good , deep cycle is all you need Right on! Even cheaper! His battery is most likely on its last legs anyway. Thanks everyone! Sent from my SGH-I747M using proboards |
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eastcoastcam
Jeeper
Is it time to go wheeling yet??
Posts: 1,690
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Post by eastcoastcam on May 6, 2015 9:03:56 GMT -4
Not even , a good , deep cycle is all you need Right on! Even cheaper! His battery is most likely on its last legs anyway. Thanks everyone! Sent from my SGH-I747M using proboards That would do it... When my battery was on it's last day, I was winching a car out of the ditch, and since it couldn't keep up with the draw, my Jeep stalled out. Had to get a boost, and then off to Costco it was for a new battery  ... |
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