Question about Guest 2111a Universal Mount Marine Battery Selector Switch (230 Continuous 345 Momentary Amps Black)

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I have an electric friction motor on trike, For more distance I am adding a second battery (12v 18ah) in parallel. Need to put switch in line so one battery runs at a time. Then I know it is time to go back home and will use second battery. What gauge wiring do I need? Can I turn off the second battery when home and charge each one separately? I have two 2amp chargers. Thanks for your time, Chrome

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Hi Chrome

I'd use pre-made automotive battery cables as they'll easily handle the amperage output as well as already having the ends factory installed.

With your battery selector switch, you'll be able to charge one batt at a time.

You'll need a ground from one battery to the switch and a common ground cable connecting the ground of batt 1 to the ground of batt 2 to make this work. Each HOT lead from the batts goes to the switch.

Hope this helps.

Posted on Mar 18, 2011

  • roamwchrome Mar 19, 2011

    Thanks for reply. The batteries are motorcycle. Won't the ready made cables be to long? The batteries will be back to back becaise of space problems. They won't be the heavy car cable. I thought it would be easir and cheaper to make them. Besides they will have to be cut to put the switch on. Thanks

  • Steve
    Steve Mar 19, 2011

    Thanks for clarifying your battery type.
    I'd estimate that your current draw would be in the order of 30 amps or so, o a primary cable of 10 ga should suffice. (10 gauge will work up to 55 amps.)

    A good website for wire specificatrions is at:

    Good Luck!



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