Here's some info from the Delco Remy service-bulletin. It says not to use the regulator without the "L" terminal on tractors.
That being said, I've done it many times. I just crank up the voltage. But, that's on tractors that don't get used a lot. If a tractor was used many hours at a time, it could be a problem.
Delco-Remy field-service bulletin for L and non-L type regulators. D-R bulletin # 7275, July 8, 1969
STANDARD CURRENT-VOLTAGE regulator often used in cars and trucks. A regulator without the “L” terminal is unsatisfactory for tractor use because the low volage settings would result in an insufficient charge to the battery during cool weather. This condition is more pronounced in tractor batteries because their location usually allows them to become colder (that in autos and trucks). If the voltage setting is increased to compensate for the cold, the setting will be too high in warm weather.
NON-STANDARD COMBINATION CURRENT-VOLTAGE regulator with “L” termial . When a heavy load is used, especially lights, the generator output increases. The regulator has an extra terminal marked “L” which is connected with the lower contact point in the cut-out relay. This extra terminal permits current from the generator to be diverted to the load without it passing through the current-voltage regulator. Generator output, therefore, is allowed to inrease to a value sufficient to handle the load and still supply charging current to the battery (if limits are not exceeded).
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