Checking the generator rotor [Toyota Carina T190]

1. Check if there is a break in the excitation winding.

Using an ohmmeter, measure the resistance between the slip rings.

• Nominal resistance (in a cold state) — 2.7-3.1 Ohm

If the resistance tends to infinity, i.e. the circuit is open, then replace the rotor.

2. Check if the excitation winding is shorted to ground.

Using an ohmmeter, measure the resistance between the rotor pole and the slip ring.

If the resistance is 0 (the circuit is closed), then replace the rotor.



3. Check the slip rings.

a) Check the working surfaces of the contact rings. They should not have any burrs or chips.

b) Using a caliper, measure the diameter of the slip rings.

• Nominal diameter - 14.2-14.4 mm
• Minimum allowable - 12.8 mm

If the contact track diameter is less than the minimum permissible value, replace the rotor.