TM 10-3930-671-24 VOLTAGE REGULATOR SETTING TEST (45Amp Systems)- Connect 1/4 ohm resistor and the test ammeter to system as shown in Figure 16.1, start engine, and accelerate engine to a fast idle.  The 1/4 ohm resistor is positioned in series with the test ammeter, then applied to the circuit as shown in Figure 16.1.  The resistor will reduce charging current to less than  10  amperes,  thus  allowing  charging  voltage  to  rise  to  the  regulator  controlled  maximum.    If  test  result  indicates  a lower voltage, voltage regulator may be defective.  High voltage may be due to a high resistance regulator ground circuit (black lead), or to a defective voltage regulator.  Repair or replace regulator. FIGURE NO.  16.1. F-283