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@Ronmar has a good video on youtube (rronmar) showing how he 'upgraded' his 90's truck which is more similar, than @MatthewWBailey and my truck, to yours—

Good advice above. These units started with a dual 12/24v 100a alternator that as folks have mentioned was overloaded trying to maintain the four batteries in 2 in series-24v banks. Over the years they tried several different configurations. I believe the mid 90's units had a polarity unit...