TM 10-3930-671-24 TESTING FOR REGULATOR VOLTAGE SETTING (22/30 Amp Systems)- This test requires the application of a 1/4 ohm series resistance between alternator output terminal and output lead, to reduce charging current to approximately 8 to 10 amperes (Figure No.  12).  Reducing current output will allow system voltage to rise to the operating level of the voltage regulator. FIGURE NO.  12. The 1/4 ohm resistance may be incorporated in many commercial volt-ammeter assemblies (Figure No.  13.). Switching the system knob from direct to 1/4 ohm is all that is required to establish series resistance.  Separate 1/4 ohm resistors are available and easily inserted in the system as shown in Figure No.  14. FIGURE NO.  13. FIGURE NO.  14. F-281