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I have a 52 B3B and wanted to change to a negative ground 12 volt alternator. I used an alternator from Oreilly Auto part number 01-0041 which cost $75.00 because I did not have a core. I made a U shaped bracket and welded it to the top of the original bracket that bolts to the block. I made the U shaped bracket about 1/2 inch longer on the inside which would allow me to move the alternator forward or backward to help align the fan belt and put in washers to take up the space. From position 2 on the alternator I ran a wire to the battery terminal. I then ran a wire to the battery terminal on the regulator disconnecting the field and armature wires from the regulator. I switched the wires on the coil so the points would be negative ground. I switched the cables on the battery so it is negative ground. The wiper motor is now running backward but does not seem to be a problem. It is still the 6-volt motor and I plan on putting a resistor in to reduce the voltage. The heater motor is now running backward. I will probably have to switch it out for a 12-Volt negative ground motor. I still need to switch the wires on the back on the amp meter so it shows charging as opposed to discharge. The starter is working fine with the 12-volt negative ground. The alternator does not charge at an idle but will begin charging about 800 rpm. The only problem I have is alternators seem to be designed to run clock wise looking toward the back of the alternator (drivers seat). The motor in my Dodge runs counter clockwise as looking from the drivers seat. This means the alternator is running backward. It will charge fine running backward but the cooling fan on the alternator is running backward which may cause it to overheat. I will have to run it a while to see if it gets hot. Larry