Sym HD 125 Service Manual page 196

Inspection on regulator rectifier
Remove the luggage box, rear carrier and body
covers.
Disconnect two 3 pin couplers of the regulator
rectifier.
Inspection the rectifier coupler to the wire harness
passes the condition.
Item Check Points Standard Value
Main switch
R – B
connection
Battery
R – G
connection
Charging coil Y – Y
If the readings measured are not normal, check
parts in the circuit.
If the parts are normal, then trouble is in the wiring.
If there is nothing wrong with parts and wiring,
replace the regulator rectifier.
To this chapter contents
Battery voltage
(ON)
Battery voltage
0.17 ~ 0.8Ω
17. ELECTRICAL SYSTEM
Regulator rectifier
17-7