Testing Stator

ALTERNATOR 4 Amp Fig. 201 - Rectifier Plug Testing Stator If “short” test indicates stator is shorted, look for obvious shorts on leads. If bare leads are found, repair with friction tape and shellac. If shorted leads are not visible, replace stator. Stator should also be checked for continuity as follows: Use VOA meter, set on resistance scale. Touch one test prod to lead at fuse holder. Touch other test prod to each of the four pins in plastic connector. See Figure 202. Unless the meter shows continuity at each of the four pins, .the stator winding is open and the stator must be replaced. Fig. 202 - Testing Stator Testing Rectifier Attached to the blower housing baffle is a small black rectifier box. A lead from the box connects to a single pin in the detachable plug. See Figure 201. Leave box installed on blower housing. Test rectifier with multimeter (using resistance scale) to check resistance from the pin to blower housing (in an unpainted clean area). See Figure 203. After checking pin, reverse meter leads and recheck. The meter should show a reading in one direction only: If the rectifier pin shows a meter reading both ways, the rectifier is defective. If the pin shows no reading either way, the rectifier is again defective. Fig. 203 - Testing Rectifier Testing Alternator Output Install ammeter in series with charging lead, as in Figure 204. Start engine. Ammeter should indicate charge. If ammeter shows no charge, and if rectifier has been tested, look for loose connections, broken or frayed wires, etc. If there is no visible fault, replace stator and re-test alternator output. Fig. 204 -- Testing Output 63