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64 3020 12V ???

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JOHN

01-10-2001 09:09:06

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MY 64 3020 GAS HAS A DELCO ALT. THAT LOOKS LIKE IT HAS BEEN CHANGED FROM A GENERATOR AND A 12V BATT.
WAS THIS A 6 VOLT SYSTEM OR 12V WHEN NEW?? IT HAS 12V BULBS IN GAGES ALSO . THE ALT HAS A JUMPER WIRE FROM THE LARGE TERMINAL TO 1 WIRE ON THE DOUBLE PLUG IS THIS THE CORRECT WAY TO WIRE THESE WHEN CHANGING OVER?? HOW IS A 1 WIRE DELCO HOOKED UP WITH 2 WIRES FROM A GEN?? THANK YOU

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WTW

01-10-2001 10:56:25

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Re: 64 3020 12V ??? in reply to JOHN, 01-10-2001 09:09:06

John, Your 64 3020 gas was originally a 12 volt positive ground system. The alternator was a alteration to replace the original generator. To make the alternator work the system was converted from a positive to a negative ground system. There are many ways to wire the Delco's to make them charge. I will give you the instructions to do it the most correct way and you can decide what you want to go with.
3020 GAS 12 VOLT POS. GROUND CONVERTED TO 12 VOLT NEGATIVE GROUND USING DELCO ALTERNATOR MAINTAINING WORKING INDICATOR CHARGE LIGHT First switch your battery and ignition coil polarity (as you probably have already done). Negative terminal of coil to the distributor and negative battery post to frame. Leave battery ground off negative post while working with wiring connections. Second remove old generator and regulator. Mount the Delco alternator on tractor maintaining correct belt alignment(already done?). Third unwrap wiring harness covering at regulator/ generator connections. Remove and discard short wire that connected the regulator field terminal to the generator "F" terminal. Cut off the wire with end at regulator connection that connected the regulator GEN terminal to the generator "A" terminal. This will leave you with two wires to put female terminals on to connect to the number 1 and 2 terminals of alternator regulator terminals. The wire that you cut the short jumper from (Old GEN Wire) will go to #1 terminal of the new alternator (Left Terminal when viewed from the back of Alternator) and the old Battery Terminal wire (Heavy Wire) will go to #2 terminal of alternator. Run a new heavy wire (10 or 12 Gauge) from the battery output terminal post of alternator to the starter battery cable terminal. This is important to run this new heavier Load wire as the alternator output will be to great for the original 14 gauge wiring. There is no need for the diode in the circuit/ system because the indicator bulb will act as a resistor in its place. The thing that you have to remember is, that if the bulb should ever fail the charging system will not work until it is replaced. The indicator will function just as it did with the generator. Hook up your battery ground connection and check it out. You may notice at each start up that the engine RPM will have to be raised a little to initially energize the alternator and once the light goes out the engine can be set to its very lowest idle speeds and the alternator will continue to charge and keep the light out. Good Luck, Dave Wickman

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