1948 Cub 12V Conversion Wiring

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amcnab44

New member
Hey all, got a question for you. I am the proud new owner of a 1948 Cub that I got from my buddies uncle. He used it for plowing snow for a number of years and then about 15 years ago he parked it, had the generator rewound to 12V, and bought a project car. He didn’t touch the Cub again until he sold it to me. Because he never had it running he didn’t wire it up, so I am having to rewire the whole tractor with new wiring. My question is - what is the correct wiring diagram for a 12V converter cub with a rewound generator and a new voltage regulator?
 
Put the electrical wiring on the back burner.

Engine free?
Primed the oil pump?
Compression tests?
Valves most likely stuck.

If you can get the engine running - - convert to single wire 12 volt alternator.
 
Depends on what sort of 12-violt regulator you have. It also depends on whether you have a magneto or battery ignition. Either the original 6-volt with cut-out diagram or the slightly later 6-volt with regulator diagram may be all you need, or possibly a mix of the two.
 
Are you saying the wiring is missing or are you thinking because it's now 12V you need different wiring? In that case the original wiring can easily handle the load. Yes, it's twice the voltage but only half the amperage so from that aspect it's good to go.
 
Looks like it’s the standard 12V regulator from Steiner. It was kept as a magneto ignition - as far as I can tell, the only things changed were the generator and regulator. Everything else was kept original to 1948
 
radioguy41":bpkkf18f said:
Are you saying the wiring is missing or are you thinking because it's now 12V you need different wiring? In that case the original wiring can easily handle the load. Yes, it's twice the voltage but only half the amperage so from that aspect it's good to go.
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No, all of the original wiring was unplugged and the wires were not in the best condition when I got it
 
Identify the voltage regulator from the part numbers stamped on it.

If it were mine, I would take the generator to a shop and have it tested. Make sure it's 12 volts and still in good condition.
amcnab44":2rwwwwm3 said:
About 15 years ago he parked it. He didn’t touch the Cub again until he sold it to me. Because he never had it running he didn’t wire it up
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What did you do to the tractor to get it running?
 
Eugene":3ftjd0gy said:
Identify the voltage regulator from the part numbers stamped on it.

If it were mine, I would take the generator to a shop and have it tested. Make sure it's 12 volts and still in good condition.
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The only things stamped on it are “1413 12V”, so I’m assuming it’s a generic Steiner branded or similar regulator
 
If all components check out as presented, use the standard 1948 wiring diagram with one change. Remove the wire that currently goes from the generator "F" to the light switch. Add a short wire from the generator "F" to the regulator "FLD".
 
Jim Becker":qe3kqknw said:
If all components check out as presented, use the standard 1948 wiring diagram with one change. Remove the wire that currently goes from the generator "F" to the light switch. Add a short wire from the generator "F" to the regulator "FLD".
Click to expand...

Perfect, that’s just what I needed to know. Thank you!
 
generator can be tested easily without taking it to the repair shop to see if its working, if its already off the tractor take a jumper from battery positive to A terminal on the generator, a jumper from battery ground to F terminal on generator, generator should "motor" if it does this remove the f terminal wire and it should spin a little faster if it does this generator is working, if its on the tractor just loosen to take belt off and run the same test
 
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