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Old 07-30-2018, 07:13 AM   #3
O C Diver
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City: Fort Myers, FL... Summers in the Great Lakes
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 12,834
I also have a 4045 that came with a serpentine belt. Think it would be quite difficult to replace the alternator with a large frame high capacity one as the length and diameter of the alternator could be problematic. If you plan to charge a large house bank ( mine is 900 ah) you will likely want an external 3 stage regulator. If the bank gets down to 70%, you could be charging in bulk stage for an hour or more. This requires a large frame alternator to handle the continuous load and heat. The compact frame high output alternators aren't designed for continuous output above about 70%.

My solution was to mount a second alternator with it's own serpentine belt. Below are some pics of the 2nd pulley & adapter, alternator mounting and external regulator. Pics are during my refit, so the wiring wasn't complete. I like the idea of a second dedicated alternator for the house bank while leaving the original alternator and wiring intact.

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3 stage Sterling regulator is mounted on the wall in the upper right corner.

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Ted
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