Diode Trio Test
- Remove diode trio from end frame. Connect an ohmmeter to single connector and to one of the 3 connectors. See Fig 1. Note reading and reverse leads. If readings are the same, replace diode trio.
- A good diode trio will give a high and low reading. Repeat tests between single connector and each of the 3 connectors. Connect ohmmeter to each of the 3 connectors. If any readings are zero, replace diode trio.
NOTE:
Before replacing diode trio, also check rectifier bridge. DO NOT
use high voltage, such as 110-volt test light, when testing diode trio.