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USD 419
Part #: MG8247

Mean Green High Output Alternator 8247

Vehicle Fitment:
2001-2007 GM Duramax LB7/LLY/LBZ | See full application list below
Part #: MG8247
★★★★★ ★★★★★ 3 Reviews
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The Mean Green High Output Alternator 8247 is the answer to the charging problems in your 2001-2007 GM 6.6L Duramax. The Mean Green Alternator can charge any engine no matter what its' power requirements. The Mean Green Alternator's tool steel rotor shaft is supported at both ends by heavy duty double sealed bearings. Even the heavy duty solid copper starter windings are sealed with high temperature insulation. Another is the heat resistant, multi-function integrated regulator which continues to operate even at extreme temperatures.

  • 200 Amp Output
  • No More Charging Problems
  • Precision Balanced for Smooth Operation
  • 1 Year Unconditional Guarantee

Vehicle Fitment

2001 Chevy 6.6L LB7 Duramax
2002 Chevy 6.6L LB7 Duramax
2003 Chevy 6.6L LB7 Duramax
2004 Chevy 6.6L LB7 Duramax
2004.5 Chevy 6.6L LLY Duramax
2005 Chevy 6.6L LLY Duramax
2006 Chevy 6.6L LLY/LBZ Duramax
2007 Chevy 6.6L LLY/LBZ Duramax
2001 GMC 6.6L LB7 Duramax
2002 GMC 6.6L LB7 Duramax
2003 GMC 6.6L LB7 Duramax
2004 GMC 6.6L LB7 Duramax
2004.5 GMC 6.6L LLY Duramax
2005 GMC 6.6L LLY Duramax
2006 GMC 6.6L LLY/LBZ Duramax
2007 GMC 6.6L LLY/LBZ Duramax


  • MFG. Number 8247
  • Manufacturer Name Mean Green
  • Shipping Weight 22.00 lb.
  • Shipping Length 8 in.
  • Shipping Width 8 in.
  • Shipping Height 7 in.
  • Fuel Type Diesel
  • Warranty Info 1 Year
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L0.00R0.00


★★★★★ ★★★★★
3.3/5 Stars out of 3 Reviews
Verified Buyer
Premature Failure of Mean Green Alternator
Order # 1167395 I ordered this with intention of adding additional electric cooling, but haven't gotten there yet. I Installed in July of 2020, and last week, the alternator failed - specifically the voltage regulator on this mean green HO alternator. In the process, it was not charging at all, and then creeping up to 19 volts DC. Because of that, it caused my two Optima Red tops (AGM) to vent and ruin them both ($250 each). While this is a good alternator in theory, I wish I would have went with a dual set up so I could have been more reliable and not damaged my batteries and electronics. If I was on the road, or not close to my house, this could have been catastrophic and lead to thermal runaway on the batteries and an engine fire. I've contacted Mean Green and will attempt a warranty replacement, but they only have one year warranty (unconditional) with their product.
installation was kind of a pain gettin the old 1 out but puttin in the mean green was easy. everything runs great n lights in my dash are coming back.
Great replacement for stock alternator
It wasn't any harder to install than taking old one out. In fact it was easier since God invented You Tube. It has been 6 months and is producing power as advertised.

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Questions and Answers

Do I need to upgrade my charging cables to handle the extra amps?
View Staff Answer 

No, you may use all of your factory cables with this Mean Green High Output Alternator.

Is this a 2 pin or 4 pin connection? I have a 2005 Chevy 2500 HD with a 6.6lit Duramax deisel. I believe that it requires a 4 pin connector.
View Staff Answer 

The Mean Green High Output Alternator 8247 utilizes the factory 4 pin connector on the 2001-2007 GM Duramax LB7/LLY/LBZ.

Will this fit a 2013 2500hd Duramax?
View Staff Answer 

Only the 2001-2007 GM Duramax LB7/LLY/LBZ

Does this alternator come with internal regulator? 2006 GMC Sierra 3500 w/duramax
View Staff Answer 

The MEAN GREEN HIGH OUTPUT ALTERNATOR 8247 will be a direct swap with the factory alternator for all 2001-2007 GM Duramax LB7/LLY/LBZ vehicles.

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