How to Upgrade Early QSB alternator from delco 19si to 24se or 28sisi

[1sadler]

I want to upgrade the alternator on my early Cummins QSB 380 from a Delco 19si to a Delco 24siWould someone check me on this? On my early (2005) QSB 380: I think I need New mounting bracket: Cummins Marine Alternator 4? J180 Support BracketNew wiring harness: Cummins 4920029 Marine 24SI 28SI Alternator Wire HarnessAnd the 24si Delco alternator.If this is correct, do I need a different belt? I´ve read the belt does not need to be changed, but maybe it does.Thanks for any help on this–

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[1sadler]

Thanks Tony. I’ll change the belt. And do I need the “Cummins Marine QSB 5.9 Alternator Support Swing Arm (3971982) as well?”   (I must have all the parts needed when I travel to the boat to do the work).

[Tony Athens]

Done right,  you will need a different belt. Plenty of pics on the web site in “Tony’s Tips”

[Author]

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