Yamaha T8 Rigging Manual page 139

Outboard Rigging Guide - 2001
(Recommended Battery Wiring with Accessory Battery Shut Off Switch)
WARNING
Improper battery connections or wire size selection may result in a fire.
1. When one battery is used, connect the two red cables to the (+) terminal. If the smaller red
cable is left unconnected, an accidental contact of the red cable with the (-) terminal of the bat-
tery will form a short circuit and may cause a fire.
2. When using an accessory battery, a negative connecting cable must be installed between the
accessory battery and the main battery. This cable must be equivalent to the main battery
cable. If the battery is wired differently than shown below, a larger negative corrective wire is
required.
1 Primary starting battery shut off switch (single battery high current type)
2 Optional auxiliary battery shut off switch (minimum capacity 80 amps)
3 Accessory shut off switch (capacity determined by current requirements of accessories and wire size
used)
4 Optional twin engines with three batteries, the isolator leads from both engines could be wired
to the accessory battery for electronics.
Multifunction
meter power
(red) lead
Fuse 10A
NOTE: Switch #2 is not required, the battery isolator on the motor will prevent current from flowing to
the electrical components on the engine, even if this lead remains connected to the battery. However, the
switch #3 can be installed to shut off electrical power to the accessories.
Motor
(S Side)
Red Engine Red
On
Off
1
Black
Battery 3
Battery 1
for Accessory
for cranking
Negative
Connecting
Cable
Motor
(P Side)
On
OPT
2
4
Black
Battery 2
for cranking
3
Accessory
3-28
Battery Installations
Red
Red
Off
1
Battery Cable
Small Wire