Sym GTS 250 Service Manual page 198

Inspection on AC. Generator coil
Remove the luggage box, rear carrier and body
covers.
Disconnect 3 pin couplers of the generator coil.
Connect an ohmmeter to the each terminal end.
Check the continuity of the each terminal end, and
engine ground with short circuit?
If there is no continuity or short circuit, replace the
AC. Generator.
V
Y1 70~80
Y2 70~80
Y3 70~80
And you can check voltage by engine is running.
Current Leakage Inspection
Turn the main switch to OFF position, and remove
the negative cable terminal (-) from the battery.
Connect an ammeter between the negative cable
terminal and the battery negative terminal.
Disconnect each cable one by one and take
measurement of the current of each cable to
locate the short circuit.
Allowable current leakage: Less than 1mA
Caution
In the current leakage test, set the current
range at the largest scale, then gradually
decrease to the lower scale as the test process
goes to avoid possible damage to the ammeter
and the fuse.
Do not turn the main switch to ON position
during test.
If the leaked current exceeds the specified value, it
may indicate a short circuit.
To this chapter contents
Ω
0.2~0.4
0.2~0.4
0.2~0.4
17. Electrical System
Y1
Ω
Y2
Ω
Y3
Ω
Y1
V
Y2
V
Y3
Battery negative terminal
Ω
V
17-7