Upper Contacts

1. With engine at normal operating temperature and ignition switch off, disconnect wire at "IGN" terminal of regulator and install an on-off switch and wire in series with voltage regulator and wire disconnected from regulator (see illustration). Connect positive lead of a voltmeter to on-off switch and negative lead of voltmeter at a good ground.
2. Disconnect lead at alternator "BAT" terminal and connect an 0-50 ampere scale D.C. ammeter in series between terminal and disconnected wire.
   CAUTION: If field circuit is grounded on "FLD" terminal of regulator when removing or installing lead while ignition is on, fuse wire in regulator circuit will be blown and regulator damaged.
3. Connect carbon pile between battery posts, then start and operate engine at 1250 RPM. Adjust carbon pile to obtain a 15 ampere output on ammeter. No current reading on ammeter will indicate a low set regulator or a blown fuse wire between upper stationary contact and "IGN" terminal. Correct as necessary, then operate engine for 15 minutes to ensure system temperature is normalized.
4. With engine operating at 1250 RPM and carbon pile adjusted to maintain 15 amperes, measure temperature at regulator by holding a thermometer 1/4" from regulator cover.
   Fig 1: VOLTAGE REGULATOR TEST CONNECTIONS

   Courtesy of CHRYSLER GROUP, LLC

Cycle voltage regulator circuit by momentarily opening and closing the on-off switch several times. Voltmeter will now indicate setting of upper contacts. If regulator operates within specifications, proceed to test lower contacts. If reading is not within specifications, remove regulator cover and adjust voltage setting as outlined. See  Upper Contact Voltage Setting  .