I recently converted FIL 4010 from 24 to 12 volt. Not a real difficult process.
I considered many of the conversion kits to be over priced, and they all seem to come with a one wire alternator which loses function of the charge lamp which it already had.
I ordered a 12 volt planetary drive starter (under $200.00). I had a spare Delco 3 wire alternator, and a salvage start solenoid from an old Ford pickup.
I used the existing generator bracket, turned it over and used a cut off blade on an angle grinder to notch one end of the bracket to give clearance for alternator. Added a large washer between alternator pulley and fan to extend pulley for better belt alignment. Used existing belt.
Using a one wire alternator in this application you will lose the function of the charge light. I prefer a 3 wire alternator. Loop #2 pin to output. Black wire at center G terminal on old 24V regulator is for lamp, connect this wire to #1 on the alternator. On the main start switch I moved the other end of light wire from GEN on the switch to Lights A on the switch. This bypassed an internal resistor in the switch and connected lamp to 12 volt source.
Existing Blue and Brown charge wires were in good condition so I kept them. As per other’s advice I added an auxiliary start solenoid between start switch and starter solenoid.
Tractor is not used during winter so I am using one group 31 1000 CCA battery.
I am very happy with the change over. Tractor starts as good as before and alternator begins charging immediately. This setup will be much simpler to maintain, and new starter and alternator would be far less costly than old generator/regulator or starter replacement.
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