I'm with JimN and John T! By tinkering with the current limiting relay inside the voltage regulator you can dramatically increase generator amp output beyond design spec. However operating it this way is a sure recipe for a generator burnout.
Better to replace the generator with a higher output generator or with an alternator.
However before doing suggest you check ALL the wiring in the generator output circuit: generator ARM to regulator GEN, regulator BAT to ammeter, and ammeter to battery. Even a tiny resistance - less than 0.1 ohm - anywhere in this circuit will seriously limit generator output.
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FWIW we had an early 60's IHC farm dump that would never charge more than about 15 amps from its 45 amp generator. Replacing generator and regulator made no improvement. Only after removing the instrument panel, discovering an overheated (thus indicating high resistance...) wiring terminal behind the ammeter and replacing it did the problem disappear.
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