Checking diodes (page 2 of 2)

1. Undo the bolts shown fixing the alternator assembly.
2. Dismantle the following alternator components:
   • A. Rear support plate with stator windings
   • B. Rotor
   • C. Front support plate
3. Checking inductor (rotor) winding resistance at the slip rings
   • Place the two probes of an ohmmeter (set on a scale of Ω x 1) in contact with the rotor slip rings (shown by the arrows): the instrument reading should show a certain resistance value.

NOTE If the resistance value is infinite (broken circuit)rrotto), then the rotor has to be replaced.

4. Checking stator winding insulation
   • Place the two probes of an ohmmeter (set on a scale of Ω x 1) in contact with the windings and the stator casing, respectively;
   • the resistance reading on the instrument should be infinite, if this is not the case replace the rotor.