Yanmar 3YM30 Sevice Manual page 51

(10) Check the wiring connectors.
Check whether each connection part doesn't have looseness.
Neutral safety switch
(Fitting to marine gear)
Alternator
Battery switch
20 30
B-type panel
10
0
Battery
STOP
40
B OFF
GLOW ON
50
START
Safety
Extension
relay
wire harness
To earth bolt
Starting motor
36
2. Inspection and adjustment
Glow connector
Glow plug
Glow relay
Magnet relay
To lube switch and
fresh water switch
Stop solenoid