The Right Way to Hook Up a Relay to 12 Volt Power. While you might be tempted to just run the positive wire from your relay directly to the positive terminal on the battery, that is a big no-no.

Locate the room thermostat on a wall near the return air box about 48 inches from the floor. Connect the low voltage thermostat wiring to the low voltage control block in the unit. Refer to the wiring ...

Fortunately, we found the initial low-speed amperage spike for this pair of 10-inch fans was only 27 amps with a continuous draw of just over 10 amps, which makes it easier on the charging system.