We at Spicer's Boat City service department get an enormous amount of calls referencing dead batteries.

A simple solution to help stop a slow battery drain is to install a Perko switch, this is an on off switch that shuts power off to all electrical accessories. Some new boats come with this feature.

As boats become more advanced electrical systems demand more power. If you are not sure that your boat is equipped with this feature they are typically located in the rear of the boat.

Medium Duty. For use with two or more batteries and single or dual engine systems.
Permit selection between batteries for starting and charging or operation of both batteries in parallel.
They allow addition of an extra battery for use with accessories.

The "OFF" position also acts as an emergency disconnect in the event of an electrical problem.

Ignition protected. Surface mount.
For use with systems under 50 volts. Capacity - 250 amps continuous, 360 amps intermittent. Alternator Field Disconnect (AFD) Models, when used with non-utilized alternators, these models will interrupt the field current (reducing the possibility of damage) if turned "OFF" with the engine running. Size": 5-1/4 dia. x 2-5/8 deep.

Note: If your boat has an excessive battery draw we recommend having your boat properly diagnosed for this symptom.