I install them off the battery lug at the solenoid, through a fuse and to the switch. That way you can use the sprayer with the tractor off, plus it won't interfere with other fuses and circuits.

What Tom said. Most auto stores carry a two prong connector that makes it easy to unplug the sprayer when not in use. Best to run the ground back to the battery to ensure minimum voltage drop.

The pull behind sprayer I have had the long wires with one wire to the positive side of the battery and one to the ground side of the battery.(instructions from sprayer) So I put a toggle switch in the dash and ran the wires to it from the battery. Then ran one of the two prong wires canguy speaks of to the rear of the mower. Now I just plug in the wires from the sprayer at the rear of the mower. The toggle switch has a little light in it that lights up when I have it turned on. Now after reading these posts I wonder if I should have a fuse in the line somewhere? Even though the sprayer instructions never mentioned it and so far no problems.?? Tks.....Dayton

Cheap protection. Put it between the battery lug and switch + lead.