TM 10-3930-653-14&P 4-7-6.  REGULATOR 4-7-6-1.  DESCRIPTION The voltage regulator is   temperature compensated so  that    the  charging    voltage  copes  with  the  climatic changes and two units are housed in the regulator box: a voltage regulator relay and a pilot lamp relay. The effect of    temperature    fluctuation    on    their    relay    setting    is minimized by the use of a bi-metal spring. 4-7-6-2.  REMOVAL To   remove   the   voltage   regulator,   disconnect   the multiple connector and remove the regulator. 4-7-6-3.  INSTALLATION Installation is a reversal of removal procedure. 4-7-6-4.  MEASUREMENT OF REGULATOR VOLTAGE (1)   Connect  a  voltmeter  and  an  ammeter  with  a  fully charged   battery   and   resistor   as   shown   in   Fig.      7-47. Install  a  regulator  perpendicularly  with  connector  facing downward. Note:   Make   sure   that   all   electrical loads   (such   as   head   lamps)   on   lift truck have been switched off. Fig. 4-196.  Regulating Voltage Measuring Circuit with Regulator and Alternator Mounted on Lift Truck (2)   In  an  over  temperature  compensated  regulator.  it  is necessary to measure temperature of the regulator cover as   the   regulating   voltage   is   varied   according   to   the surrounding temperature. In this case. use a thermometer   or   cylindrical   thermometer   with   putty   as shown in Fig.  7-48. (3)   Before starting the operation, be sure to short-circuit the   line   between   the   terminal   of   resistor   for   voltage measurement and (-) terminal of the ammeter. Pointer of ammeter    may    deflect    rapidly    and    reversely    due    to discharge current flowing from the battery. resulting in a damaged ammeter. thermometer Fig. 4-197.  Measuring Regulator Cover Temperature 4-110