Wiring to share battery - Go Devil and trolling motor

[BlindHog]

I want to be able to place my battery in the bow for weight distribution reasons. (Small 12ft alum vhull)

Want to still have my electric trolling motor (transom mount) and 9 HP electric start Go Devil share the battery.

Rather than running 2 sets of wires, what could I use back at the stern to switch the battery between motors? (Like the switches that allow you to change between battery A and battery B.)

As always, I am on a budget and this is a very simple lowtech rig. Thanks for any suggestions.

[whistlingwings]

Low tech...
Bolt your 3 + together bolt your 3 - together and tape them up.

Or have a look here, you can build one of these for next to nothing
http://www.boatingstore.com/us/distribution-stud-module-p13404.html

[BlindHog]

Thanks Winston,

I apologize for ignorance. So its just a straight simple hookup with all 3 bolted if I dont use that box.

I thought it would need to be switched to prevent, say, the cranking of the GD from impacting the trolling motor. But I guess if the trolling motor isnt trying to draw, nothing will happen there.

One more question: Will I get heat buildup at point of intersection when running the trolling motor? Will I get loss of voltage due to the long (16') run from battery or use battery up faster with trolling motor under this setup?

[whistlingwings]

Use #6 or #8 wire for the run. The larger the better.

With any longer run of wire you'll see a voltage drop. You will need a 50 amp circuit breaker on the trolling motor to help prevent it burning the switch out

Coat the bolted connection with Nolox or similar and it wont corrode near as fast.

[Hit-n-Miss]

If your gonna run that far use 4 gauge wire.

[Dead Ringer]

Definitely no need for a switch. Running all circuits at once (all draw) will create no issue since each is on it's own circuit after the junction box. The only limitations will be the power of your battery, the size of your wire, and the amperage rating of the junction box. The easiest way to determine the wire gauge would be to use a chart (http://74.50.20.110/wiringdiagram.jpg). Err on the side of two large to avoid the possibility of frying wires, even if battery cable is not cheap.