KYMCO MXU 300 - Page 33

1. GENERAL INFORMATION
1-30
MXU 300/250
POOR CHARGING (BATTERY OVER DISCHARGING OR OVERCHARGING)
Undercharging
Dead battery
Faulty battery
Faulty A.C. generator coil
Broken yellow wire
Shorted pink and yellow
wires
Broken red wire
Faulty regulator/rectifier
Poorly connected coupler
Faulty A.C. generator
Overcharging
Broken green wire
Poorly connected coupler
Faulty regulator/rectifier
Start engine and tes
t
limit voltage of battery
terminals
Connect battery (+) wire
to regulator/rectifier
coupler red wire and
battery (-) wire to engine
g
round and test volta
g
e
Inspection/Adjustment
Inspection/Adjustment
Symptom
Symptom
Probable Cause
Probable Cause
Normal voltage
B
attery
h
as vo
l
tage
with ignition
switch “ON”
Normal
Voltage does no
t
increase
B
attery
h
as no
voltage with ignition
switc
h
“ON”
Resistance too high
Normal voltage No voltage
Measure resistance
between AC generator
coil terminals
Normal
Abnormal
Check regulator/rectifier
coupler for loose
connection
Normal
Abnormal
Connect battery (+) wire
to regulator/rectifier
coupler green wire and
battery (-) wire to engine
g
round and test volta
g
e
Check regulator/rectifier
coupler for loose
connection