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John T
12-27-2002 07:02:09
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Re: 3020 GENERATOR TO ALETRNATOR CONVERSION in reply to MICHAEL, 12-26-2002 19:40:47
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Michael, first, if its a 12 volt system and you want to use a GM 10 SI Alternator, it has to be converted to negative ground. If its a 24 volt system, these instructions are not applicable. The wire that used to go to the Battery (Bat) terminal on the old Voltage Regulator, now goes to the big output terminal on the back of the GM alternator. Another small #12 wire also connects there and hooks to the No. 2 or F small side terminal on the alternator. A No. 14 wire begins at the ignition switch where its 12 volts when the ignition switch is on (like the wire going to the ignition coil) and in series with it use a 5 to 10 ohm 5 watt resistor and a diode/rectifier rated 50 volts DC at 5 amps of current. Ive seen them with none to 10 ohms and all work fine (biggest is best to be safe however so as to not over current the exitation circuit) and the power rating of the resistor (the 5 watts) doesnt need to be that big but 5 watts is a heavy duty unit. The diode doesnt need to be quite 5 amps rated (1 will probably work with a 10 ohm resistor), but again, 3 to 10 or any size you can purchase will work. Wire the diode positive to switch and negative to alternator. That wire from the ignition switch with the resistor and diode in series, then gets connected to the number 1 or R side terminal on the alternator. Some models like yours use an idiot light for the generator, and that can still be utilized in some cases and as a substitute for the diode, because it provides the load to prevent backfeedign the ignition when the ignition is off, but I would need the wiring diagram and type of 3020 to tell you how to wire it that way versus the diode as described herein. To convert to neg grnd, reverse the batetry to neg grnd, reverse the leads on any ammeter so it reads correct, and wire the ignition coil so the little neg terminal goes to the distributor and positive gets power from the switch. Again, this is for a 12 volt system negative ground and NOT for a 24 and the idiot light wires might still be able to be used if I knew exactly what you had. Good Luck Ol John T Nordhoff in Indiana
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