What size wire for my new battery switch?

[tony_cliffy]

I'm adding one of those Blue Sea battery switches that will let me connect my house battery to my starting circuit in the event my starting battery fails. Currently my house battery feeds a circuit panel using #8 wires. How big a wire do I need to go to this switch if it maybe used to start my motor? My motor is a 2004 Johnson 115HP 4-stroke.

 

[Dunaruna]

Re: What size wire for my new battery switch?

You will need 'battery cable' size. The size needed depends on the length. <br /><br /> http://www.emarineinc.com/products/alternators/cables.html

 

[tony_cliffy]

Re: What size wire for my new battery switch?

Thanks Dunaruna! Now I guess I have to figure out what my cranking amps are to turn over the engine? I have no idea! It is a 2004 Johnson 115HP 4-Stroke...anybody know?