Install Dual Battery SW

[bogydave]

Plan to move the Battery forward & install a battery sw.

Aluminum boat

Dual Battery Switch wiring question ? ?
Some say switch the +12V
Some say Switch the - 12V
What is best?
Is there a standard?

Opinions/reasons?
Negative side switched like on heavy equipment like Cat.
Safer if ground is removed from all metal ?
The only place I see negative getting to the boat is thru the engine mounting.

2.
Is #4 wire large enough for about a 10 foot run?

[boats.net]

What size motor do you have? If it's a V6 fuel injected then can use 4 gauge if total length of cable is under 13 feet, if over use 2 gauge.
Switch positive cable.

[boscoe99]

The motor is grounded to the boat. Nothing that you can do about it. Think of the motor and the boat as being one, from a grounding standpoint.

Generally, the positive feed from the battery is switched. On when the motor is being used. Off when the motor is not being used.

[bogydave]

What size motor do you have? If it's a V6 fuel injected then can use 4 gauge if total length of cable is under 13 feet, if over use 2 gauge.
Switch positive cable.

F115TJR
Engine batt leads reach to within 8 ft.

Single batt
No battery drain on a river boat,
Engine start & a tach I just installed.
bilge pump, that needs wired in

Will go with + lead disconnect.
Use a dual batt Sw in case I ever want to add dual batts.