This may be a stupid question and a stupid idea, but here goes.
I need to rewire my boat for a bigger trolling motor. Right now there are two
#8 positive wires and two #8 negative wires running from battery area to where trolling motor plugs in.
The trolling motor manufacturer says that this model of motor requires #6 wires.
Can I attach the two #8 positive wires to a heavy duty marine buss terminal located by plug
in receptacle and then a short piece of #6 to tie into receptacle? And do the same for negative side with another buss?
It is not the best solution but it would certainly work fine. Make certain
that you have the correct circuit protection in the positive lead at the battery.
I have a basic 16.5 aluminum open river sled with a single engine. Currently the motor runs off one 12v battery with a manual bilge pump switch hooked up.
I would like to add a second battery for:
Electric trolling motor
Navigation lights, to be installed
Bilge pump to this battery
In addition I would like to add a 12 volt two bank
marine electrical boat battery charger for both batteries. I will add a 6 position fuse panel to the mix.
My questions or concerns:
Any interaction between the 12vdc system and the 120v battery charger to insure that I don’t get a ground fault. Would adding a battery switch assist with this potential problem or will a bus bar
Thank you for any input,
Since your system is 12 volt only, I would connect all of your grounds together, including your batteries, at a common bus.
You will only trip a ground fault outlet if there is a fault from ac hot to boat ground and the boat is connected to earth ground.
If this happens it will not matter if you have a battery switch or not.
Could you please check out my homemade boat wiring diagram? It’s for my 17.5′ Crestliner Fish Hawk.
As you can see, I added and wired the two Attwood battery selector switches and a fourth battery to the system (Battery 2) and wired all the batteries in parallel. I also added the Blue Seas fuse block, all lighting, fishfinder, trolling motor, etc.
My goal here is to be able to run the trolling motor off the extra battery if needed and/or to be able to start the motor with the extra battery if the main died. Also, to run all the lights off the extra battery for night fishing. I’ve yet to turn both switches to “both” because I’m not sure if that would be bad for……..everything.
I’m obviously an amateur at this so was wondering if you think it’s a safe setup assuming all the fuses, connections, wire gauge, etc. are kosher? I haven’t had any trouble yet but I’m a little nervous about burning something up.
I’d really appreciate your input if you can decipher the wiring diagram.
I would make a couple of minor changes:
Move the trolling motor circuit protection to the trolling motor side of the switch.
Add circuit protection for the Blue Seas fuse panel at its connection location to the boat battery switch.
Use the same size boat battery cables for all of your battery link wires. You call out 4/0 for the positive lead (I would assume you mean 4 AWG) but not on any of the other cables.
If the trolling motor batteries are near the bow of the boat I would consider adding circuit protection at each end of this wire to help reduce the risk of a catastrophic fault.
Hope this helps,
Thanks for the help Kevin. I’ll do all of that.
Also, I was wrong about the battery cable being 4/0, its actually 1/0 welding cable.
Most people don’t use welding cable on boats or cars because it is not oil resistant.