SERVICE SHEET No. 1050 (contd.)
Testing the Alternator on the Machine,
using an A. C. Voltmeter and I Ohm Load Resistor
Conclusions from these Tests
Low reading on any group of coils indicates shorted turns.
Zero reading will indicate open-circuit coil.
If all coils read low, partial de-magnetization of rotor may have occurred as a result of faulty
rectifier. Check rectifier, and battery earth polarity before replacing rotor.
A reading between any one lead and the generator stator indicates an earthed coil. Replace stator
or locate earth by isolating and testing individual coils.
Note
With the engine running at 3,OOO r.p.m. (approx.) the output voltages are steady, and even if
the engine is running a few r.p.m. faster or slower the values stated will be obtained from a good
generator.
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