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Are your battery cables FAT, say 00 gauge? Walmart specials kill the starting on 6 volts because of the voltage drop. The ammeter won't care about the voltage, though an alternator may push more current through it than it can indicate. A new 60 amp alternator is the cheapest part of a 12 volt conversion. You need a regulator for the alternator that matches the alternator and the combination needs to be wired like it was in the car or truck. You need to swap the wires on the ammeter and the ignition coil when you change from positive to negative ground. And, of course, on the battery which can prove to be a pain because of the differences in post diameters which may lead to a couple new battery cables. You also need to be sure of ground connections being clean and of the starter having good bearings and brushes. If the 6 volt starter is worn down and the armature is dragging on the field poles it will smoke on 12 volts, otherwise if not used for minutes at a time the 6 volt starter will run fine on 12 volts and it spins the same direction no matter which battery polarity. Gerald J.
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