Alternator amp rating.

I would say the max amp alternator you can safely run, without any mods or updates, is exactly what it came with originally.
Replace the ammeter with a voltage gauge, and do the MAD bypass, and you might be good with the 75amp. Personally I would upgrade the entire charging circuit, but then again, I have a good reason for feeling that way..'69 wiring with a 65amp alternator

View attachment 1715122765
OMG, I'm clearly too new to these old Mopars.. there's an amp gauge? Ya, you could melt that. I was assuming that going to the 75Amp alternator meant upgrading the wiring to anywhere you would be sending extra current (like to brighter relayed lights, and battery I suppose!, and whatever else). I rescind my post.... I'd stick with the original alternator... this amp gauge business is just crazy... get rid of that thing.