Rectifier Bridge Test
Refer to illustration and determine which rectifier bridge is being checked. "A" has round stud bases and "B" uses rectangle connectors at base of three studs. Refer to checking procedure "A" or "B".
"A " Connect ohmmeter between grounded heat sink and one of three terminals as shown in illustration. Reverse ohmmeter connections. If both readings are same, replace rectifier bridge. One reading should be high and other should be low or zero. Perform same test between grounded heat sink and each of other two terminals and between insulated heat sink and each of three connectors.
"B " Connect ohmmeter between grounded heat sink and one of connectors as shown in illustration "Checking Rectifier Bridge," Do not connect ohmmeter to threaded stud, rather to rectangle connector at base of stud . Press down hard to get good connection. Reverse ohmmeter connections. If both readings are same, replace rectifier bridge. One reading should be high and one low or zero. Perform same test on each of other two connectors and between insulated heat sink and each of three connectors.