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#2 · Apr 6, 2015
Most likely you have bad batteries--over charging from the alternator suggests that a battery is shorted internally and the alternator is trying to bring the voltage up.
The Duramax has two batteries, and they are connected together to make one BIG battery. It takes a lot of amps to turn the the high compression engine over and build sufficient rail pressure. Be sure to replace them in like pair, if they show bad after testing. Be sure they isolate the one being tested or the test will be invalid.
Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.
Joined Jun 16, 2008
#4 · Apr 7, 2015
Moved to LMM-- no further response from OP
Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.
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OneSlickGlide Apr 7, 2015
Chevy and GMC Duramax Diesel Forum
A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more!
General Discussion 01-04.5 LB7 Duramax Powertrain Introductions Exterior 11-16 LML Performance Parts Discussion