REGULATORS

ENGINE VOLTAGE AMPERAGE PART REF NO WESTERN
CUT OUT RELAY VARIOUS 6 – 12 – 24 D1702/D1703 D100
FORD 6 VOLT B CIRCUIT 81-2904
FORD 12 VOLT B CIRCUIT 81-2905
FORD INDUSTRIAL 6 VOLT A CURCUIT 8N-10505-B 81-2906
FORD INDUSTRIAL 12 VOLT B CURCUIT GR278 81-2903
GMC DELCO 6 VOLT A CURCUIT 1118212 81-1922
GMC DELCO 12 VOLT A CURCUIT 1118219 81-1900
LUCAS 6 – 12 VOLT B CURCUIT

POLARIZING THE ELECTRICAL SYSTEM

Whenever a generator or a generator regulator is tested, repaired, or replaced, the generator must be polarized. If this is not done, the generator may be damaged and the regulator contacts burned. Reversed polarity will discharge the battery – or damage it.

There are two types of generator and electromechanical voltage regulator combinations used with DC generators.

In an “A Circuit” system, the field is grounded through the regulator. “A Circuit” systems are found in GM vehicles.

Ford and Chrysler vehicles had a “B Circuit” system which was grounded internally through the generator.

To polarize an “A Circuit” system, connect the FIELD, ARMATURE, and BATTERY leads to the regulator. Connect the battery. Then, momentarily connect a jumper wire between the ARMATURE terminal and the BATTERY terminal at the regulator.

To polarize a “B Circuit” system, connect the FIELD, and ARMATURE leads to the regulator. Connect the battery. Then, just before installing the BATTERY lead, momentarily touch it to the ARMATURE lead terminal.