Testing for Short in Stator or in Rectifier

Dual Circuit Alternator with Fuse

Testing Rectifier - TM-5-4240-501-14P_217

TM-5-4240-501-14P Special Diver Air Support System (SDASS) NSN 4220-01-292-3708 Manual
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ALTERNATOR Dual Circuit- Fuse Type Fig. 177 - Testing Alternator Charging Output If VOA meter shows no reading, test stator and rectifier. Testing for Short in Stator or in Rectifier Disconnect charging lead from battery, and connect small test lamp in series between battery positive terminal and fuse cap, as shown in Figure 178. DO NOT START ENGINE. Test lamp should not light. If it does light, stator’s charging lead is grounded or rectifier is defective. Unplug rectifier plug under blower housing. See Figure 179. If test light goes out, rectifier is defective. If test light does not go out, stator charging lead is grounded. Fig. 178 - Testing for Short in Stator or Rectifier Fig. 179 - Rectifier Plug Testing Stator Charging Coils If ‘”short” test indicates stator charging lead is grounded, remove blower housing, flywheel, starter motor and retaining clamp (see figure 175) and examine length of red lead for damaged insulation or obvious shorts on lead. If bare spots are found, repair with electrical tape and shellac. If short cannot be repaired, replace stator. Charging lead should also be checked for continuity as follows: Use multimeter, set on ohm Rx1 scale. Touch one test prod to lead at fuse holder. Touch other test prod to red lead pin in plastic connector: See Figure 180. Unless the meter shows continuity, the charging lead is open and the stator must be replaced. Fig. 180 - Checking Charging Lead for Continuity The charging coils should be checked for continuity as follows: Using the multimeter, touch one test prod on each of the black lead pins as shown in Figure 181. Unless the meter shows continuity, charging coils are defective and stator must be replaced. Test for grounded charging coils by touching one test prod to a clean “ground” surface on the engine and touching the other test prod on each of the black lead pins as shown in Figure 182. If the meter shows continuity, the charging coils are grounded and stator must be replaced. Fig. 181 - Checking Charging Coil Continuity 56

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