TM 10-3930-671-24 Before starting engine, switch system knob of ammeter to DIRECT, or if a separate resistor is used, by-pass resistor with short,  heavy  (No.    10  wire)  jumper  cable.    (Carbon  Pile  is  not  used).    Start  engine  and  run  for  5  minutes  at  fast  idle  to normalize  temperature  of  components.    Insert  series  resistance  in  circuit,  with  knob  or  removing  jumper  on  separate resistor.  Charging current should drop to 8-10 amperes, voltmeter will indicate voltage regulator setting, refer to Table No. 1, for temperature corrected settings. TABLE 1. REGULATOR AMBIENT TEMPERTUER If higher voltage is indicated, check regulator leads 3 and 4 for secure connections.  A jumper cable with insulation piercing alligator  clips  (Figure  No.    15)  may  be  used  to  by-pass  any  plug-in  connector  that  may  present  an  intermittent  circuit (Figure No.  16).  Repair or replace doubtful leads or connectors. FIGURE NO.15. FIGURE NO.  16. F-282