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Old 07-12-2018, 10:47 AM
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2004LB7 2004LB7 is offline
Join Date: Dec 2010
Location: Norcal
Posts: 1,755


I know that the ECM has control over the duty cycle of the regulator in the alternator. This is pretty obvious from looking at the wiring and schematic diagrams. How much control it exerts over it I don't know. That is way I said I wouldn't be surprised if it did.

My LB7 seamed to put out a constant duty cycle and a steady voltage at the alternator but my LMM seams to vary this far more. I haven't had a chance to look over an LML but I know it has been creeping into more and more vehicles.

Alternator self exciting for a nominal voltage is quite normal so it will not normally drop below that if the alternator is in good shape
2008 Chevrolet 3500HD DRW LTZ
285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

2006 BRM Jetta TDI. Injectors, turbo, Malone custom tuning on ecm and tcm
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