Using the voltage-sensing wire can make a big difference in some cases. I just built a portable gas-driven battery charger. It has a 72 amp Delco 12SI hooked to a 6 horse gas engine. 10 feet of charge cable leads with #2 copper. Alternator was one I had laying around that already had an aftermarket self-excite "one wire" regulator. I tried charging a solar battery bank with it and got pretty fed up. When charging at high amps - it had 14.2 volts at the alternator but only 13.7 volts at the battery bank. The battery bank would never rise above 13.7 volts because the alternator thought it was at 14.2 volts. I finally took the alternator off and stuck in an OEM Delco standard regulator and ran a separate sense wire to the bank with #10 copper. Now it works great and the battery bank comes up over 14 volts.
Obviously on a tractor with a battery three feet away from the alternator, it does not make as big as difference.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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