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Just installed a stock 2001 cherokee e fan in addition to my mech fan. When I turn it on I get a huge voltage drop. Under 9 volts. The mj almost completely dies from the load on the initial start up. I also am in the process of adding a 40 and 20 inch ligh bar, 2 led spots and two fog lights on the rear bumper. So I need to get a bigger alt ASAP.

 

What are my upgrade options. If I remember right my stock alt only has about 60ish amps. I would like to be above 100 if possible. Also will I need to upgrade wireing?

 

It's going on a 88 renix 4.0

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Good advice all.  ^^^ These 10-blade late model XJ fans can suck up 24A on startup and 9A-15A while running. There's no way a 60A alt can handle this extra load over normal as you have seen. I have two of these fans installed. Did the Jon Kelly mains cable upgrade, installed a larger Group 34 battery and a Dodge V8 136A alt. This is adequate with everything running at night including the H4 head lamps and driving lights, and the blower motor on at HI speed. If I turn on A/C along with everything else, I do have a slight voltage drop. So for me a larger alternator is probably needed. It's very important to upgrade your electrical system capacity to handle at least 100% of the total load w/o a sustained voltage drop. It prevents unwanted smoke tests and/or wire fires.

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Not to sound rude, but you gotta actually go through and look at what all is offered. Here is a link to the same site Oceanic supplied, only modified for your exact truck: http://www.autopartswarehouse.com/search/?N=0&VN=4294962346+4294962302+4294967145+4294964365+4294966684&No=0&Nr=AND%28universal%3A0%29&Npp=10&use_warranty_code_parent=AutoTrust&Ntk=Main&Ntx=mode+matchallany&Nty=1&Ntt=alternator&D=alternator&Dx=mode+matchallany&mvtgroup=B&Npp=50

 

They have all the way up to 300 amp ones if you feel like spending a crazy amount. You can also look around on other sites.

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  On 6/17/2013 at 1:25 AM, GirsMJ86 said:

Not to sound rude, but you gotta actually go through and look at what all is offered. Here is a link to the same site Oceanic supplied, only modified for your exact truck: http://www.autopartswarehouse.com/search/?N=0&VN=4294962346+4294962302+4294967145+4294964365+4294966684&No=0&Nr=AND%28universal%3A0%29&Npp=10&use_warranty_code_parent=AutoTrust&Ntk=Main&Ntx=mode+matchallany&Nty=1&Ntt=alternator&D=alternator&Dx=mode+matchallany&mvtgroup=B&Npp=50

 

They have all the way up to 300 amp ones if you feel like spending a crazy amount. You can also look around on other sites.

Not rude. Factual.

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Ok sorry i just wanted to make sure those were 100% bolt ons. Looks like the highest "affordable" output one is the 100amp for around $70.00 I would really like to be in the 150 amp range but can't afford the $350.00 price tag.

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  On 6/17/2013 at 2:32 AM, Zebvance said:

Ok sorry i just wanted to make sure those were 100% bolt ons. Looks like the highest "affordable" output one is the 100amp for around $70.00 I would really like to be in the 150 amp range but can't afford the $350.00 price tag.

you will be good with the 100amp unit.  and if you add off road lights down the road go LED..they use very little power.

I run three electric fans in the dirt bound shroud and have them to start and run all at same time and its just a small power drop at startup .(100amp alt)

but it sounds like you have a weak alternator or you need to update all your grounds. and your MJ will work much better after you update the grounds .

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  On 6/19/2013 at 2:19 PM, mjeff87 said:

I'm running a stock 136 amp alternator out of a ZJ in mine.......$12 out of the junkyard.  Along with 5-90's cable upgrade, like Don.

 

Jeff

Did you have any clearance issues or did it bolt right up?

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This is how I'm going to do it:

I was going to do a complete HO swap into the 87, things change, still going to put an HO motor in it

but with Renix engine controls. Since the motor is an HO I will be using a Dodge 136A alternator I got from the JY

for $50, without the ECU to control it I will be regulating it with this

 

http://alternatorparts.com/external-voltage-regulator-high-output-alternator-kit.html

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