TESTING STATOR COILS

ALTERNATOR Tri-Circuit TESTING STATOR COILS With multimeter, check continuity between ground lead to stator coil and output connector lead shown in Figure 209. Meter should show continuity. If meter does not indicate continuity, replace stator. Fig. 209 - Checking Continuity Next, be sure ground lead terminal is not touching a grounded surface. Check continuity from terminal to ground. See Fig. 210. Meter should not show continuity. If meter indicates continuity, coils are grounded and defective. Examine lead to be sure the insulation is not -worn or cut. Repair with tape and shellac if a bad spot is found. If ground still exists, sator must be replaced. Fig. 210 - Checking for Grounded Wire in Stator Assembly CHECKING DIODES Disconnect charge lead from stator output lead. Using a multimeter set on resistance scale, check diodes by attaching one meter lead to connector pin. Touch the other meter lead to the white wire (light circuit diode), then reverse meter leads. Meter should show continuity in one direction only. Repeat this procedure for the red wire (battery charging diode). Meter should show continuity in one direction only. If meter shows continuity in both directions or does not show continuity in either direction, the diode harness must be replaced. See Fig. 211. Fig. 211 - Checking Diodes in Wire Harness The resistor that reduces battery charging current should also be checked when testing alternator. See Fig. 212. An acceptable resistor should have approximately one ohm resistance. Also check to be certain the double pole switch is operating properly. See Fig. 207. Fig. 212 - Checking Resistor and Switch 65