RustyRodder Posted July 9, 2017 Share Posted July 9, 2017 Evening guys, So the other night over some drinks, my cousin and I were talking about our cars and whatnot. My jeep came up, and my auxiliary lighting setup shortly after. Followed imediately by the question- will my charging system be up for it? I know the standard comanche alternator is 75A, but that you can do the GM upgrade to 105A easily. My lighting setup has two KC 69's (100W with a 40amp relay), two spotlights (100W and an 8.5A draw), and twin 50W lights on the rear. While I doubt I will run them all at once, how badly am I screwing the pooch here? Any advice on what I could do to improve it, other than the 105 alternator and cable upgrades? Link to comment Share on other sites More sharing options...
Dzimm Posted July 9, 2017 Share Posted July 9, 2017 You'll probably be just fine, just don't expect long battery life with the truck off and the lights on. If you want a bigger alt, go to autozone and ask for a new alternator for a 98 Jeep xj (for some reason it doesn't show up when you look it up under MJ), they will ask what size, pick the bigger one. It's 140amp and you'll have to do some, not a lot, of grinding on the alt bracket for it to fit. Upgrade your battery cables to handle the higher amperage and your good. Your other option is to do a dual battery setup along with the upgraded cables. I am doing a second PDC to run my accessories, in a factory fuse box on the drivers side, along with a dual battery where the air box goes. This is by far the more expensive route. All together I will probably have close to $1000 in all the equipment necessary to run my electrical setup. This includes the cowl intake kit to remove the stock airbox, full cable kit, bigger alt, second battery, fuses, relays, solenoid, etc.. This is the way overkill route and gives you tons of upgrade room. Link to comment Share on other sites More sharing options...
Jeep Driver Posted July 9, 2017 Share Posted July 9, 2017 Link to comment Share on other sites More sharing options...
RustyRodder Posted July 9, 2017 Author Share Posted July 9, 2017 You'll probably be just fine, just don't expect long battery life with the truck off and the lights on. If you want a bigger alt, go to autozone and ask for a new alternator for a 98 Jeep xj (for some reason it doesn't show up when you look it up under MJ), they will ask what size, pick the bigger one. It's 140amp and you'll have to do some, not a lot, of grinding on the alt bracket for it to fit. Upgrade your battery cables to handle the higher amperage and your good. Your other option is to do a dual battery setup along with the upgraded cables. I am doing a second PDC to run my accessories, in a factory fuse box on the drivers side, along with a dual battery where the air box goes. This is by far the more expensive route. All together I will probably have close to $1000 in all the equipment necessary to run my electrical setup. This includes the cowl intake kit to remove the stock airbox, full cable kit, bigger alt, second battery, fuses, relays, solenoid, etc.. This is the way overkill route and gives you tons of upgrade room. Dual-battery was brought up, or upgrade to an optima at least. Won't the renix have trouble with 91+ alternators, since they have an external regulator? Link to comment Share on other sites More sharing options...
Dzimm Posted July 9, 2017 Share Posted July 9, 2017 Oh that's a good point. I'm not sure how the regulators would react. Sent from my HTC U11 using Tapatalk Link to comment Share on other sites More sharing options...
HOrnbrod Posted July 9, 2017 Share Posted July 9, 2017 If you want a bigger alt, go to autozone and ask for a new alternator for a 98 Jeep xj (for some reason it doesn't show up when you look it up under MJ), they will ask what size, pick the bigger one. It's 140amp and you'll have to do some, not a lot, of grinding on the alt bracket for it to fit. Upgrade your battery cables to handle the higher amperage and your good. ^^ This is only for HO models in which the alternator is regulated by the ECU. I used this alt. No grinding required............ Link to comment Share on other sites More sharing options...
RustyRodder Posted July 10, 2017 Author Share Posted July 10, 2017 Wouldn't that one also not work on a renix model?Sometimes I really wish i had waited for a 91 comanche to come up- but I doubt it would have been rust free and 900 dollars. Link to comment Share on other sites More sharing options...
Jeep Driver Posted July 10, 2017 Share Posted July 10, 2017 Wouldn't that one also not work on a renix model? Sometimes I really wish i had waited for a 91 comanche to come up- but I doubt it would have been rust free and 900 dollars. You should have a typical Delco CS130 alt, GM. You actually have more options than the HO guys...........you may have to reclock one, but that's easy. I used a '86 Capice alt, 105 amps, before I got the Powermaster, which I highly recommend. I have the 2.5 which uses the small case, you should have the larger case......again, more options. Link to comment Share on other sites More sharing options...
HOrnbrod Posted July 10, 2017 Share Posted July 10, 2017 Wouldn't that one also not work on a renix model? Sometimes I really wish i had waited for a 91 comanche to come up- but I doubt it would have been rust free and 900 dollars. It would work on a Renix using by an external regulator and HO alternator bracketry. I've seen several writeups on NAXJA on how to wire these Nippon Denso alts up on a Renix. Link to comment Share on other sites More sharing options...
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