REGULATOR CONNECT TO VARIABLE O GROUND RESISTANCE ii 11 F GEN BAT A f ADDITIONAL LOAD 44 0 0 BATTERY AMMETER VOLTMETER GENERATOR TO DASH CONNECTOR e Fig 8 11 Checking Current Regulator Setting carbon pile or bank of lights so as to drop the system voltage to 12 5 13 0 volts 3 A variable rheostat of 25 watt capacity can be inserted into the generator field circuit as shown in Figure 8 11 This can be used to decrease and increase the voltage of the generator as required in the cycling procedure without changing engine speed I 4 Operate the generator at 1600 engine rpm for at least 15 minutes to establish operating temperature The regulator cover must be in place r 5 Cycle the generator and note the current regulator setting For cycling procedure see instructions under Voltage Regulator Setting 6 To adjust the current setting turn current regulator adjusting screw shown in the middle unit of Figure 8 7 clockwise to increase current setting or counterclockwise to decrease the setting See caution note under Voltage Regulator Setting Check for Oxidized Regulator Contact Points r NOTE Oxidized regulator contact points may be the cause of a low generator output or a discharged battery 1 Connect an ammeter into the charging circuit fig 8 12 and turn on headlights 2 Operate the generator at a speed which will produce a charge rate of 5 amperes 3 Ground the F terminal of the regulator as shown in Figure 8 12 4 If generator output increases more than 2 amperes oxidized regulator contact points are indicated and the regulator should be removed from REGULATOR JUMPER LEAD FROM F TERMINAL TO GROUND I GEN BAT ol oio A F TO BATTERY TO DASH i CONNECTOR AMMETER GENERATOR Fig 8 12 Checking for Oxidized Contact Points the car and both the current and voltage regulator contact points should be cleaned as outlined under Generating Circuit Servicing o f Units O f the Vehicle GENERATOR When belt tension is properly adjusted but the generator does not perform satisfactorily on the car inspect the commutator If the commutator is dirty clean it by holding No 00 sandpaper or a cleaning stone against it while the generator is operating at idle speed Never use emery cloth to clean the commutator If this does not satisfactorily improve generator performance the generator should be removed from the car for a thorough check as outlined under Generating Circuit Servicing of Units Of the Vehicle SERVICING OF UNITS OFF THE VEHICLE BATTERY Testing Batteries may be tested off the vehicle in the same manner as described under Generating CircuitChecks and Adjustments on the Vehicle Common Causes of Battery Failure When a battery fails the cause of failure may lie outside the battery itself For this reason when a battery failure is encountered do not be satisfied to merely recharge or replace it Find the cause of failure and prevent recurrence of the trouble Listed below are some of the common causes of battery failure