Yamaha EF1000iS Service Manual page 84

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AC coil 2 AC voltage inspection
9 Connect White-Orange (R-S), Orange-White (S-T),
and White-White (R-T) leads.
9 Start the engine, then measure the voltage. (Tester
range: AC120V)
R
AC coil 1
S
T
R
AC coil 2
S
T
AC coil 2 AC voltage:
13.5 ~ 23.0 V at 20 °C (68 °F)
GOOD
DOES NOT GENERATE
Economy switch continuity inspection
9 Switch "ON" → Continuity
9 Switch "OFF" → No Continuity
CONTINUITY
Replace the control unit.
GENERATOR SYSTEM
Br W
W Br
Br W
Or G
Br W
W Br
TOO LOW
NO CONTINUITY
Magnetic force is weak.
Replace the magneto rotor.
AC coil 2 resistance inspection
9 Stop the engine.
9 Measure the resistance between White-Orange
(R-S), Orange-White (S-T), and White-White (R-T)
leads. (Tester range: Ω × 1)
R
AC coil 1
T
R
AC coil 2
T
AC coil 2 resistance:
0.17 Ω ± 20% at 20 °C (68 °F)
SPECIFICATION
Replace the AC coil 2.
5-9
ELEC
S
W Br
Or G
W Br
S
OUT OF SPECIFICATION