2003 Hummer H2 6.0L Alternator Upgrade

[Hummer_Guy]

Hello, all.

 

I have installed several sets of off road lamps (14 55w 12v lamps in total) on my H2 (Same engine set up as a 2001-2006 GM 2500/3500 Silverado/Sierra) , and notice a power draw when I have all of them on at the same time (lights dim etc). It has been recommended to me to install a more powerful alternator to compensate for the new power needs, rather than going with dual battery set up at this time. I believe the factory alternator is a 145amp Delphi. What is the power output at idle (500rpm)? I am looking at replacing it with one of two aftermarket alternators rated at 225amp and 250amp. Which would be better for my application? TIA.

 

https://www.amazon.com/LActrical-OUTPUT-ALTERNATOR-CHEVROLET-WARRANTY/dp/B00C3RDNZC

 

https://m.summitracing.com/parts/pwm-48237/none/images

 

 

[dewfpo]

Calculate your amp load at idle and look at the charts for each alternator.

 

The 250 amp alt. on Amazon says it makes 100 amps at 550 rpm.

 

Post a question on the Summit site to find out how many amps the 225 amp unit makes at idle.

 

DEWFPO

[Chris]

My 300 amp makes over 200 at idle

[Swimmer8366]

That's what I would throw in there is a 300 or I would go dual like they offer from factory.

 

Sent from my Z981 using Tapatalk

[Chris]

That's what I would throw in there is a 300 or I would go dual like they offer from factory.

 

Sent from my Z981 using Tapatalk

Mine came from DC Power Engineering

https://youtu.be/CMWlM2NxygU

Edited November 8, 2016 by Chris

[Hummer_Guy]

For the 300 amp, did you have to put on a non-factory belt? Is the pulley on the 300 amp alternator the same size as the factory belt?

[Chris]

For the 300 amp, did you have to put on a non-factory belt? Is the pulley on the 300 amp alternator the same size as the factory belt?

Factory size belt for the 145 amp alternator