Bigger alternator

[kramer56]

Ok I am thinking of a bigger alternator but my build sheet only says its a 105 amp w 2 bats. The only one i can find is the 145 ampere. Is there a bigger one than that for LLY 2004? I plow snow and have alot of short runs this year and the bats dont get charged very good. Which would be better high amp or a 2nd alt? which is cheaper and how much work would it be? BTW this site looks great I havent been here in awhile lol sorry for that

 

[CtChevy427]

There was just a recent discussion about plow trucks and power. Check out this thread.

http://www.thetruckstop.us/forum/showthread.php?26159-2nd-battery-install-for-plow-operation

Also take a look at this P/N at NAPA. NNE 1N4812HO 200 Amp alternator. http://www.napaonline.com/Search/Detail.aspx?R=NNE1N4812HO_0232588667

 

[kramer56]

That 200 amp and that 250 amp alt, will i need a different belt and mounting bracket? will they have a bigger pully?

 

[RI Chevy Silveradoman]

http://www.alternatorparts.com/

http://www.mean-green.com/index.html

http://www.pitstopmotorsports.com/

These are a few right off the top of my head. You can run dual 145's. The stock setup for dual alternators is dual 105's. Or you can get one of the higher output single 250 or 300 amp. The single replacement alternator will be your easiest fix. The others require a little more work.

I think this one is a direct replacement. http://www.mean-green.com/products/200amp.html

 

[CtChevy427]

That 200 amp and that 250 amp alt, will i need a different belt and mounting bracket? will they have a bigger pully?

I believe the one from NAPA is a direct replacement.

 

[Ed HD]

I think duals would be the best option. That way when one takes a dump you still have an extra. Does anyone know what the option package was that spec'd dual alts?

 

[83GMCK2500]

I think duals would be the best option. That way when one takes a dump you still have an extra. Does anyone know what the option package was that spec'd dual alts?

RPO:

K65 - 2001-2008 - GENERATOR,105 AMP DUAL 105 AMP
8X5 - 2001-2008 - GENERATOR DUAL, 105 AMP 105 AMP DUAL GEN

No idea why there are two RPOs for it.

 

[Mad Maxx]

If you wanna go Aftermarket, get a Mechman. Best out there, Hands Down. I got a 300a from Him sitting in my Closet, waiting to put it On.

 

[THEFERMANATOR]

The stock 105 amp AD230 only puts out about 40-55 amps at idle IIRC, whereas the 130 amp AD244 can easily put out 80 amps at idle(larger rotor increases idle output to near max output). The AD244 can also be had in a 145 amp from the factory, but idle output will be near the same. I have the 130 amp AD244 on teh BURB, and even with alot of short trips with both airs running, I've never had a problem with the batteries going down on me.

 

[Franko914]

I thought the higher output alternators are able to put out higher amps at low rpm/idle because of smaller diameter pulleys?

The stock 105 amp AD230 only puts out about 40-55 amps at idle IIRC, whereas the 130 amp AD244 can easily put out 80 amps at idle(larger rotor increases idle output to near max output). The AD244 can also be had in a 145 amp from the factory, but idle output will be near the same. I have the 130 amp AD244 on teh BURB, and even with alot of short trips with both airs running, I've never had a problem with the batteries going down on me.

 

[THEFERMANATOR]

I thought the higher output alternators are able to put out higher amps at low rpm/idle because of smaller diameter pulleys?

Nope, same exact pulley diameter on both my old 105 amp AD230 and the new 130 amp AD244. The difference is the size of the rotor that spins inside. The larger diameter gives the effect of it spinning faster like if you put on a smaller pulley without actually turning it any faster. Just like a taller tire makes you go faster at the same RPM. I've ran both my airs on high(I also have an electric fan on my condensor), along with the radio on, and the headlights on with my lower 600RPM idle, and have yet to have a voltage problem with it going lower than 13.9 or so to the guages. It will go right up to almost 15.5 though on a cold day for the first 5 minutes.

 

[Franko914]

DOHHH! You did say "rotor." My bad, my bad. The larger the radius, the greater orbital speed at the same angular velocity/RPM. Thank you for clarifying that!

Nope, same exact pulley diameter on both my old 105 amp AD230 and the new 130 amp AD244. The difference is the size of the rotor that spins inside. The larger diameter gives the effect of it spinning faster like if you put on a smaller pulley without actually turning it any faster. Just like a taller tire makes you go faster at the same RPM. I've ran both my airs on high(I also have an electric fan on my condensor), along with the radio on, and the headlights on with my lower 600RPM idle, and have yet to have a voltage problem with it going lower than 13.9 or so to the guages. It will go right up to almost 15.5 though on a cold day for the first 5 minutes.