Inexpensive Way To Recharge 90-Amp Nippondenso Alternators On Deere Tractors

Inexpensive Way To Recharge 90-Amp Nippondenso Alternators On Deere Tractors TRACTORS Modifications 27-2-37 Jesse Larson, 21880 431 Ave., DeSmet, S. Dak. 57231 (ph 605 854-3108): Jesse's a diesel technology student at Lake Area Technical Institute, Watertown, S. Dak. He and Steve Peters, a diesel instructor, came up with an inexpensive way to recharge 90-amp Nippondenso alternators commonly found on Deere tractors. According to Larson and Peters, the alternator can quit charging when a diode/resistor unit - made up of two diodes and a resistor - fails. This unit is integral with the alternator's stator/rectifier assembly, so if a single diode fails the entire stator assembly has to be replaced at a cost of about $200. "The stator assembly often costs more than it would cost to replace the entire alternator with a rebuilt unit," says Larson. He and Peters solved the problem by removing a diode/resistor unit from a used Delco 10 SI alternator, modifying it slightly, and installing it on the Nippondenso alternator. Total cost was less than $5. "Delco alternators are widely available so there's no shortage of diode/resistor units," says Larson. "To install the diode/resistor we drilled out some rivets and then soldered the unit onto the old diode mounts and hooked the resistor into it."

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