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  #1  
Old November 6th, 2019, 18:29
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Rainman Rainman is offline
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alternator up grade- amps @ idle

looking to upgrade the 90 amp alternator. it realy struggles with the AC and the taurus fan in summer, thats with out the headlights.

to 136 or 160. there is $100 dollar difference, no junk yard options here.
At idle, or even 1500 rpm how much more is the 160 going to produce over the 136? Cause my understanding was the rated amprages were at higher RPMs.
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Old November 6th, 2019, 18:48
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ehall ehall is offline
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Re: alternator up grade- amps @ idle

What year is your XJ? The connector changed in 99 models. 98 and down can use the 136 amp from the ZJ and some Dodge/Ram, 99 and later can use the 160 amp from Dodge/Ram
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Old November 6th, 2019, 18:57
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Re: alternator up grade- amps @ idle

its 95 they have one in both amprages, same actual size that will fit with the 95 connector. No real junkyard options, been looking for about 4 years now for a 136, whicg were were supposed to get here........no luck so far, summer is comming.
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Old November 7th, 2019, 07:48
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Re: alternator up grade- amps @ idle

Quote:
Originally Posted by ehall View Post
What year is your XJ? The connector changed in 99 models. 98 and down can use the 136 amp from the ZJ and some Dodge/Ram, 99 and later can use the 160 amp from Dodge/Ram
You would benefit more from the larger case 160 AMP alternator if you could find one and get it to fit. They produce more voltage at low RPM which is what you really need. Some massaging of the brackets may be necessary.
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1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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Old November 7th, 2019, 13:54
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Re: alternator up grade- amps @ idle

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Originally Posted by techno1154 View Post
You would benefit more from the larger case 160 AMP alternator if you could find one and get it to fit. They produce more voltage at low RPM which is what you really need. Some massaging of the brackets may be necessary.
thanks that's what i was asking.
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Old November 8th, 2019, 10:43
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: alternator up grade- amps @ idle

I think you may be able to add a smaller pully for some more juice to.
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Old November 8th, 2019, 17:25
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denverd1 denverd1 is offline
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alternator up grade- amps @ idle

Fitment is the problem. I bought a Ram alt when mine shit the bed at Hidden Falls. Case wouldn't fit between the rail and the frame rail.

I probably need motor mounts but also have a small tcase drop so not sure where that leaves me in terms of more or less space between my rig and others. Just know that a 160 wouldn't fit

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Old November 8th, 2019, 17:26
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Re: alternator up grade- amps @ idle

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Originally Posted by 4x4JeePmaNthINg View Post
I think you may be able to add a smaller pully for some more juice to.
Like this idea on a stock alt

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Old November 10th, 2019, 01:53
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Rainman Rainman is offline
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Re: alternator up grade- amps @ idle

thanks all. Its RHD the alternator is up high where the A/c usualy goes- no frame rails. the brackets will need to be massaged as both the 136 and the 160 are the same size, but bigger than the stock 90 unit.
smaller pully is worth looking like.
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Old November 10th, 2019, 09:38
MickeyS MickeyS is offline
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Re: alternator up grade- amps @ idle

please update this thread with what pulley you decide to use and which alternator you with if you decide to stray from 90amp.

thanks!
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  #11  
Old Yesterday, 18:19
XJwonders XJwonders is offline
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Re: alternator up grade- amps @ idle

Don’t forget to upgrade your cables when swapping the alternators out.
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