WJ 4.0 Alternator Upgrade - JeepForum.com
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post #1 of 32 Old 08-09-2015, 06:56 PM Thread Starter
WJeep5
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Wj WJ 4.0 Alternator Upgrade

I've seen the 160 Amp Upgrade for the 4.7, but not sure if it'll be a good fit for my 2004 WJ 4.0.

Anyone upgraded or know which alternators fit?

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post #2 of 32 Old 08-09-2015, 07:35 PM
merdock69
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Yes, its a good fit. The only consideration is that you have to undue the bolts and kind of roll it over out of the way to change the coil pack or spark plugs. Well worth the upgrade though.
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post #3 of 32 Old 08-09-2015, 09:37 PM
Powellae
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The question is whether you need the alternator capacity. If you don't, the car won't use it and there's no advantage in doing this. Have you added a lot of electronics that pull amperage? If not, why would you consider it?
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post #4 of 32 Old 08-10-2015, 05:23 AM Thread Starter
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I have (4) 130 Watt Daylighters that each pull around 11 Amps each.
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post #5 of 32 Old 08-10-2015, 04:48 PM
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You won't notice that being pulled from a 130 amp alternator. Only about a third of its capacity and of course you have the battery to fall back on if load starts to get near alternator maximum. A good high capacity battery is probably more important to get that reserve...after all you don't drive with all the lights lit all the time (hopefully!) so the battery gets loads of driving time to recover. If I turn anything on I have 780 watts of forward lighting...about 65 amps worth....and that's before the other electrical loads like stereo etc. With nothing on my voltage meter reads dead on 14v.....with all the lights on it never drops below 13.5....or about 13 with the seat heaters. And of course I can't have my 100 watt spots and 240 watt light bar on with my brights when there is traffic coming the other way...so in reality it's rarely pulling that much load. So basically even with everything on the battery is still charging so the alt is coping. The Durango alternator "upgrade" seems like a bit of a waste of time to me. Spend your money on a good quality high capacity battery...so you will have power when you really need it, like a cold start in winter...no amount of alternator capacity will help you there!

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post #6 of 32 Old 08-10-2015, 05:17 PM
merdock69
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Our 40 amp electric fans create a much more substantial baseline load on our jeeps. One we add lights, etc... We can easily max out the 130 amp alternator with the fan on. Now if you have the hydraulic fan or mechanical only then yeah, your baseline current draw is pretty minimal.
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post #7 of 32 Old 08-10-2015, 08:23 PM
MoonyJohn
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How many amps is stock? It would be nice to have a bigger upgrade for people with winches and lights and stereo systems

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post #8 of 32 Old 08-10-2015, 10:34 PM
Captain76
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if your alternator is having issues/failing, then I would say upgrade to the 05 v8 durango 160 amp alternator just for the price break and possibility to use more amps if needed. I got a Duralast new alternator for $110 after 20% discount where the stock WJ 4.0 130 amp was $194. that alone is worth it, even if you don't use the extra right off the bat. and who knows, may come in handy down the road. with a lifetime guarantee, I will get a new one if anything ever happens to this one.

just some food for thought

if yours is fine, I say beef up your battery for now and then once the alternator goes out, then do the upgrade as well


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post #9 of 32 Old 08-11-2015, 08:34 AM
Double E
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+1 The Durango alt costs less than the Jeep spec alt. That alone is worth the swap.

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post #10 of 32 Old 08-11-2015, 08:38 AM
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Quote:
Originally Posted by Captain76 View Post
if your alternator is having issues/failing, then I would say upgrade to the 05 v8 durango 160 amp alternator just for the price break and possibility to use more amps if needed. I got a Duralast new alternator for $110 after 20% discount where the stock WJ 4.0 130 amp was $194. that alone is worth it, even if you don't use the extra right off the bat. and who knows, may come in handy down the road. with a lifetime guarantee, I will get a new one if anything ever happens to this one.

just some food for thought

if yours is fine, I say beef up your battery for now and then once the alternator goes out, then do the upgrade as well

Wow, I didn't realize there was such a price difference. Definitely worth the swap. I might look into it with my 4.0L, I thought it was only a 4.7L thing.

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post #11 of 32 Old 08-11-2015, 11:13 PM Thread Starter
WJeep5
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Put in the Durango 160 Amp Alt yesterday. Perfect fit. Like others have said, the bracket is in the way of the coil pack/spark plugs - so change those out while you have the alt out.
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post #12 of 32 Old 08-12-2015, 07:58 AM
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Quote:
Originally Posted by Double E View Post
+1 The Durango alt costs less than the Jeep spec alt. That alone is worth the swap.
+2

It was about a $60 difference between the two when I bought mine last year. The only modification I had to make was to the cable that leads from the alternator to the battery. The stud on the Durango alternator was a bit bigger than the old one, so I had to open up the hole in the cable lug to fit.

Aside from that, being that my WJ has the factory electric fan, I've noticed less of a dip in RPMs when the fan kicks on or increases in speed when sitting at an idle.

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post #13 of 32 Old 08-24-2015, 08:52 PM
Tytybooey
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Anyone have a recommendation for which type of 160 amp alternator to get? I see the 05 Dodge Durango V8 one, but does anyone suggest a specific brand and make?
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post #14 of 32 Old 08-25-2015, 05:44 AM
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My feeling is that whatever the parts store has is going to give at least 6 years of service. Match up your year with the Durango's just to be sure it will fit.

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post #15 of 32 Old 08-25-2015, 08:42 PM
Captain76
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Quote:
Originally Posted by Tytybooey View Post
Anyone have a recommendation for which type of 160 amp alternator to get? I see the 05 Dodge Durango V8 one, but does anyone suggest a specific brand and make?
I got the Autozone Duralast Gold(new) alternator for an 05 durango v8. it has a lifetime warranty so if it ever does fail I get a free replacement, so hopefully last alternator I will have had to buy.

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