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How to Wire Up a Perko Dual Battery Switch on a Boat

    • 1). Locate a convenient place to install the battery switch. The best place is near the engine compartment and current battery. Mount the second battery box near the primary battery and secure it with the brackets and screws provided with the kit, using a Phillips screwdriver. Place the second battery inside the box.

    • 2). Remove the battery box cpver and disconnect the negative or black lead from the primary battery for safety. Most marine batteries use a stainless-steel wing nut to hold the cables to the battery terminals.

    • 3). Locate the red or positive lead going from the primary battery to the starter. Remove the cable from the starter using an open-end wrench. Connect this end of the cable to the terminal labeled "1" on the Perko dual battery switch.

    • 4). Connect a new red battery cable from the second battery's positive terminal to the number "2" terminal on the Perko switch.

    • 5). Connect the second new red battery cable to the common connection point labeled "COM" and connect the other end to the starter's wiring post. Secure the connections with an open end-wrench.

    • 6). Connect a new black battery cable to the negative terminal on the second battery and connect the other end to a grounding point on the engine block. Use the same connection point as the first battery if convenient.

    • 7). Reconnect the primary battery's ground cable on the negative terminal. Secure the protective marine battery box covers to the boxes and strap them down.

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