Here is the overcharge relay wiring to fix any sensing errors at the green wire:
Its purpose when connected as above is to give the voltage sense pin on the regulator a "true" indication of the battery voltage. If it gets a lower value due to voltage drops in the key switch, wiring and connectors in the stock wiring, it will over charge the battery. Yes, this modification can use the same "cube" relay that is also in the starter improvement kit...
The charge light on the dash only indicates if the alternator is putting out a low number of amps...not an over-voltage or under-voltage condition at the battery itself.
The function of the charging circuit is to keep the
battery properly charged by supplying approximately
13.5—15.0 VDC to the battery while the engine is
The alternator (G2) produces a high (AC) output
current at high engine rpm. This output current is
controlled by voltage regulator/rectifier (N1), which is
mounted separately from alternator. Battery discharge
lamp (P3) warns the operator when alternator output
is low. The battery discharge lamp DOES NOT
monitor battery state of charge.