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Home >> Oldsmobile >> 1966 >> Dynamic Base, Eng CD ML, Standard Trans, Trans Mfr CD 160T >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Alternators & Regulators - DELCO-REMY With Integral Regulator >> Description >> Diode Trio Test

Diode Trio Test

CAUTION: Do not use a 100 volt test lamp to test doide trio.
  1. Connect ohmmeter as shown in "Slip Ring End Frame" illustration, then reverse ohmmeter connections. One reading should indicate high resistance, the other should indicate low resistance.
    CAUTION: Insure brushes do not touch each other or end frame.
  2. If both readings are same, check for grounded brush lead clip caused by broken or missing insulating washer. Also remove screw and check for damaged or missing insulating sleeve.
  3. If insulating washer and sleeve are good, remove three diode trio attaching nuts and washers and attaching screw and insulating washer. Remove stator by prying up and then remove doide trio. Connect ohmmeter as shown in illustration "Checking Diode Trio", then reverse ohmmeter leads. If both readings are same, replace doide trio. A good diode trio will have one high and one low or zero reading.
  4. Repeat test between single connector and each of other two connectors. If any one tests bad, replace diode trio.
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