Reason asking is there is a 270 amp alternator that is for sale for the 99-2005 neons. Do not know if they are compatible but having a alternator that puts off 3x the electricity as a stocker is definitely worth it at high rpms I would be saving a ton of hp

Dude, I almost had you.

Have you compared the part numbers for both at any of the online parts retailers?

If you did, you would have found your answer.

Will it fit? Maybe. But they are not the same out-of-the-box.

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2012 2500HD LML

Actually, I've wondered this myself (I've parted out a few Neons as well as all the 420a's I have done).

Dave you know it could be a very simple difference if the part numbers are different. Could even be amperage. The question would be, what is the difference?

I don't know, but the best bet would be to get one in your hands and see if there are physical differences. You can then check the specs to see if they are electronically compatible.

Captain Caveman

96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq
97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq
98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats
99 OZ 5sp Stocker 15.856 @ 85.97
99 GS stocker auto 17.7@77mph!

wiki home page:http://www.2gnt.com/index.php?d=bullettdsm

True.

I know the stud and 2-connector for the field wiring control are the same.

Most aftermarket parts catalogs place the Eclipse Alt @90 Amps and the Neon Alt @85 Amps. So something to take with a grain of salt.

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2012 2500HD LML

2gnt: '99 RS-T, killed by a toyota, pending rebuild...
Daily: Volt
Daily #2: '99 EVG ebike- STOLEN by PEDRO

Dude, I almost had you.

Why not just do the Saturn one. I think its that one. I think there was a wiki page but I can't find it. Did find these though. http://forums.2gnt.com/dcboard.php?az=show_topic&forum=5&topic_id=128037&mode=full

http://www.dsmtuners.com/forums/maintenance-repairs/411848-how-420a-saturn-alternator-install.html

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99 Eclipse gs (Daily)
89 Honda Crx (Drag car project)

Captain Caveman

96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq
97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq
98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats
99 OZ 5sp Stocker 15.856 @ 85.97
99 GS stocker auto 17.7@77mph!

wiki home page:http://www.2gnt.com/index.php?d=bullettdsm

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99 Eclipse gs (Daily)
89 Honda Crx (Drag car project)

well and that was my point. It depends if the bearings are better and how much force it takes to turn it a revolution compared to stock but regardless more electricity at higher rpms will help the spark plugs distribute more spark but like you said if it takes more force to turn it that puts more stress against the timing.

Dude, I almost had you.

Well wouldn't the voltage regulator be the same for either one. If all conditions were perfect it would produce double voltage when rpm doubles so i would think that the regulator kicks in at around 1500 rpm and starts to limit its output. I may be wrong do NOT base a decision off that but its how I see it. I would look into the Saturn one. It had been done before.

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99 Eclipse gs (Daily)
89 Honda Crx (Drag car project)

The write-up Dstach posted is my how-to.
I will say though that the 160Amp alternator i used was one of the BEST upgrades i did. i went through 4 or 5 stock alternators for all of them to take a Sh*t on me. With this Saturn Alternator ive never had an issue since i installed it. AND the saturn alternators are a really good price which you can find in higher amp. sizes also*

Ive fitted a couple other alternators to the 420a but i found the Saturn alternator to bolt on pretty easily. But the one i used was a "1 wire" alternator so i didnt have to rewire connectors and such.

Captain Caveman

96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq
97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq
98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats
99 OZ 5sp Stocker 15.856 @ 85.97
99 GS stocker auto 17.7@77mph!

wiki home page:http://www.2gnt.com/index.php?d=bullettdsm

talked to dc high output alternators and they have a 420a alternator 270a output. They told me it was 15mm bigger in diameter than stock. My question is will this be a problem with hooking up my ac? I still want ac.

Dude, I almost had you.

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99 Eclipse gs (Daily)
89 Honda Crx (Drag car project)