Relays
About Relays
A relay is a switch operated by electricity. A small current from a handlebar or dash switch energizes a coil, and the coil closes a second circuit that carries the heavy current to a light, fan, horn or other accessory. That keeps the load off the switch and its thin wires, which is why relays are the standard way to add accessories to a UTV or ATV.
Match the relay to the load. The amp rating must be higher than the current the accessory draws, and the relay must be built for 12 volts. A standard four-terminal relay turns one circuit on and off, while a five-terminal relay adds a second output that is live when the relay is at rest. A relay socket gives a plug-in connection instead of loose spade terminals, and a relay bank groups several relays in one place. The category also has a universal plug-and-play high beam kit.
Brands listed here include Grote, MB Quart, XTC Power Products and Namz. Every relay circuit still needs a fuse on the power feed, so look at Fuses & Fuse Boxes and Wiring Harnesses, Cables & Connectors to finish the job. Starter-related parts are under Starter Motor Parts. The whole group is Electrical & Ignition Components.
FAQs on relays
How do I wire a relay for an accessory?
A standard relay has two coil terminals on the switch side and two terminals for the load side. Feed battery power through a fuse to the load input, run the accessory from the load output, and connect the switch to the coil. The terminals are numbered on the relay case, so follow the diagram.
Why use a relay instead of wiring an accessory straight to a switch?
A relay lets a small switch control a large current. A light bar or fan can draw more current than a handlebar switch or its wiring is made for, so a direct connection can overheat the switch. The relay carries the load and the switch only triggers it.
What amp rating should a relay have?
Add up the current of everything the relay will power and choose a relay rated above that total. The rating is printed on the relay or given in the listing. Pair it with a fuse sized for the wire and the load, and use wire thick enough for the current.
What is the difference between a four-pin and a five-pin relay?
A four-pin relay switches one circuit on when the coil is energized. A five-pin relay has an extra terminal that is connected when the coil is off and switches over when it is on. Use a four-pin relay for simple on-off accessories.
