Suzuki DF150 Service Manual page 73

3-14 ENGINE CONTROL SYSTEM
SUB BATTERY CABLE
The ECM is battery dependent and must be provided with its own dedicated 12V power supply. The electri-
cal circuits which provide this supply are:
1. The sub battery cable to the white lead wire in the remote control extension harness to the ignition
switch.
When the ignition switch is turned ON, battery power passes from the white lead wire, through the igni-
tion switch contacts to the gray output lead wire to the No.23 terminal of ECM.
NOTE:
Ensure battery cable connections are clean and secure.
Failure at the battery connection will cause incorrect operation of the ECM and starter motor cranking sys-
tem.
2. The engine wiring harness to the main relay. When the ECM main relay is energized by turning the igni-
tion switch ON, a circuit is formed which supplies battery voltage to the No.20 terminal of ECM.
Battery
(ECM POWER SOURCE LINE)
BATTERY
Main battery cable
W
30 amp. 60 amp.
fuse fuse
W
Sub-battery cable
15 amp. fuse
W
BATT
Gr
IG
B
GND
Sub battery
cable
15 amp. fuse
Starter motor
ECM main relay
Gr
B/Bl
P/B
Gr
B
20
23
ECM
17