Alternator output tests
Start the engine and run to 6000 revs per minute as this is the speed at which the alternator starts working .
The attach voltmeter at to volts and test at the battery terminals reading should be 13,5-15v
if its less than this you have charging circuit problem if more than this a possible reg/rectifier problem .
Alternator coils testing
Set multimeter to ohms , test measurements between all three yellow wires and then all yellow wires to earth .
Stator coil resistance
122 , 0.1 ~ 1.0 ohms
123 , 0.2 ~ 0.4
3 X tests between yellow coil wires
Then test yellow wires to earth
use body of stator or black yellow wire
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see more Aprilia RS 125 posts here
