Many runabouts have just a single battery that’s called upon to power multiple 12-volt components as well as start the engine. The trouble is, a stereo playing all day while you relax at the sandbar or a baitwell pump left on inadvertently can deplete the battery, leaving you with insufficient juice to start the engine.
Blue Sea Systems’ m-LVD (Low Voltage Disconnect) is a “smart switch” that prevents dead starting batteries by disconnecting nonessential circuits before the voltage reaches a critically low level. While the m-LVD is not designed to replace the main battery’s on/off switch, you can also use it to shut off the accessory circuit. The m-LVD also allows you to override the auto shut-off. Before you get started, turn off the battery switch and disconnect both the positive and negative battery cables.
Skill Level: 2.5/5
Time to Complete: 4 Hours
Tools and Supplies
*Blue Sea Systems’ 7635 m-LVD (Low Voltage Disconnect; $70.15, pbsboatstore.com)
*Marine-grade tinned wire and cable (lengths and gauges depend on the boat size and installation)
*Crimp-on cable terminals (match cable gauge)
*Crimp-on female spade connectors (match wire gauge)
*Shrink tubing (match wire and cable gauge)
*Power drill and bits
*Box/open-end wrench set
*Electrician’s snake (for running wires and cables)
*Spool of cord (for pulling wires and cables)