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Old 04-28-2015, 11:15 PM   #1
Tony B's Avatar
City: Joe Wheeler State Park, Al
Country: Cruising/Live-Aboard USA
Vessel Name: Serenity
Vessel Model: Mainship 36 Dual Cabin -1986
Join Date: Jul 2011
Posts: 1,173
battery Selector Switches

My wiring on my boat is a nightmare. I am trying to verify stuff but I cant find any wiring diagrams/schematics on how to wire two 4 way Selector Switches to two starting batteries with two engines. the switches are Perco - the kind with.... 1 - All - 2 - OFF.

Cruising the Eastern U.S. Inland Waterways
Presently on the Tennessee River - Joe Wheeler State Park - Rogersville, Al.
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Old 04-29-2015, 12:32 AM   #2
MurrayM's Avatar
City: Kitimat, North Coast BC
Country: Canada
Vessel Name: Badger
Vessel Model: 30' Sundowner Tug
Join Date: Jul 2012
Posts: 2,397
I've been looking for information on this topic as well.

Perko instructions for one of their switches;

Perko PDF;

One switch...two battery banks; PERKO Inc.

Perko's line of battery switches; PERKO Inc.

"The most interesting path between two points is not a straight line" Murray Minchin
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Old 04-29-2015, 03:57 AM   #3
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City: Chicago, IL
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Vessel Name: Bay Pelican
Vessel Model: Krogen 42
Join Date: Oct 2007
Posts: 2,277
Suggestion for anyone who runs a boat: Use a multi-meter frequently. Bay Pelican must have four or five different types of battery switches. Whenever I rewire or install I use the continuity function of my multi-meter to determine which settings / posts are hot when the switch is turned.
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Old 04-29-2015, 05:56 AM   #4
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Join Date: Oct 2007
Posts: 14,908
IF the switch can disconnect the alt from the battery ,

ONLY purchase a rotary switch that has the 2 field disconnect terminals on the back. AND use them!

This is a break , before break , system where the field will be cut off before the battery is disconnected.

This keeps the alt from blowing diodes when the batt is suddenly removed from the circuit.
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