The 10SI is the only type of alternator listed for the Hydro 70 tractor.
A bad diode trio may cause symptoms like you are describing. If the diode trio does not provide power internally to the regulator the alternator may still continue to provide charging voltage. The filed coil in the rotor will still continue to receive power through the light bulb but the light will remain on and the output amps of the alternator will be reduced.
More likely your problem is poor connections either internally or external to the alternator.
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