Yamaha T8 Rigging Manual page 138

Outboard Rigging Guide - 2001
Dual Battery Installation
(Recommended Battery Wiring with Accessory Battery, Selector 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 made from wire equivalent to the
main battery cable. Use of a smaller wire could lead to a fire.
BATTERY SWITCH SELECTION
MODE
SYSTEM OFF
NORMAL OPERATION
BACK-UP CRANKING
NOTE:
1. SWITCH POSITION "BOTH" SHOULD NOT BE USED FOR BACK-UP CRANKING. If Battery
1 is discharged and the "BOTH" position is selected, then Battery 2 will discharge into Battery 1.
2. 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 the small wire remains connected to the battery.
However, the Switch #3 can be installed to shut off electrical power to the accessories.
SWITCH POSITION
OFF
BATTERY 1
BATTERY 2
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Battery Installations