Battery switch

Travel trailer > Mods > Battery switch


In previous years we'd keep the trailer at home between trips, plugged into the 30 amp power supply. This year we're trying something new - using the storage lot for longer gaps between trips. Because we don't want parasitic draw to exhaust the battery, I installed a battery switch - Princess Auto SKU 8105033.

Before installing the battery I wired the switch. The black wire connects to the negative battery terminal and the trailer ground wire connects to the other switch terminal.

Battery negative lead to battery switch

Because there's limited space inside the battery box, I clamped the switch (gently) in the vise and cut the terminals short.

Gently clamped to cut terminals short

I traced a rough outline of the switch back on the outside of the box and marked where I would drill the holes.

Battery box marked for drilling

Holes drilled.

Box drilled

A bit of filing and the switch was in.

Switch in place

I made a plate to go between the switch and the battery; this will keep the terminals from gouging the battery case.

Battery protection plate

The plate in place.

Plate installed

Installation complete.

Switch installed

We have power to the battery.

Switch on...battery connected

The key stays in the battery when the switch is on. When it's off the key will hang in the (locked) trailer.


Since we've switched to a solar battery box, the old box (switch included) is no longer in use.

Start of Page