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Delco Remy 40Si Alternator Upgrade

Posted 10-14-2019 at 03:45 PM by ret60sp
Updated 10-14-2019 at 03:49 PM by ret60sp

Anyone interested in following the thread and upgrading their lame OEM alternator to a much better option like the Delco Remy 40Si needs to note that they come in several models.

1. They are either 12 or 24 volt
2. They are either Pad Mount, J180 Long Hinge Mount or J180 Short Hinge Mount.
3. They come in 240, 275, 300 and 320 amp versions.

For a copy of the brochure go here.

Installing a larger alternator means it can be, or more than likely will be both a larger diameter and a longer length. Make sure you measure your engine spaces to ensure the version you are considering will fit.


On my selection, I had to move the old pulley from the OEM 22Si over to the 40 Si and install a longer 74 inch serpentine belt (up from the 70.5" OEM belt). I had to fabricate a longer lower mounting arm, out of 1/8 inch plate steel and then grind it (the new arm) to have clearance from the larger alternator fixed-fan.

The OEM wiring on my application was already sufficiently sized so that needed no change. I changed the inline covered fuse block from the OEM 150 amp setup to a marine grade ANL 350 amp block terminal with a visible ANL fuse. You can install whatever size ANL fuse meets your application on the 350 rated block. Don't buy your ANL blocks on Amazon or Ebay - they are cheap Chinese junk and you'll burn down your rig. Go to a marine electrical shop at any marina and get your electrical needs met there.

Making it a clear inspection block is much easier to see if the power goes out than the OEM setup.


Good Luck, and feel free to reach out to me if you need any help.
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