Given the complexity of your electrical system, I would not boost the system with 12 volts for starting. Twelve volts on a 6-volt system normally doesn't hurt anything, but with your sytem, it is likely to cause unexpected trouble. At least you have identified your charging system as (probably) a Leece-Neville 100 amp, 6-volt system. Since the truck currently has 8-volt batteries in it, you could use either 6- or 8-volt replacements, but the voltage regulator is probably set for 8-volt operation, probably set for about 9.6 volts- I don't remember a typical voltage setting for 8-volt systems. Be careful with the dry-plate rectifier setup- I don't know if they are as tolerant of mistakes as are metal-case diodes- they might be more tolerant of mistakes. I've never burned up a high-power dry-plate rectifier, but in low-power systems, they will clear the room in a hurry if they burn up...
Harvester
