A relay lets a low-current switch control a higher-current golf cart accessory circuit. It is useful for light bars, fans, horns and other loads when you do not want the full accessory current passing through a small dashboard switch.
What a relay does
A typical automotive-style relay has a control side and a switched-power side. The switch energizes the relay coil, and the relay contacts then connect protected power to the accessory.
Common relay terminals
- 85 and 86: usually the relay coil terminals.
- 30: common power input on many standard relays.
- 87: normally open output on many four- or five-pin relays.
Terminal markings can vary, so always follow the diagram printed on the relay or supplied by the manufacturer rather than wiring by terminal number alone.
Fuse the power feed
A relay does not replace a fuse. The accessory power feed still needs correctly sized circuit protection placed near the power source. Our accessory fuse-box guide explains branch-circuit protection.
On 36V or 48V electric carts, make sure the accessory and relay are supplied with the voltage they are designed for. See the voltage reducer guide before adding 12V components to a traction pack.
For a practical lighting example, review golf cart light-kit wiring basics. Keep wires protected from heat, abrasion and moving parts, and test the circuit before finalizing the harness.
When a relay is useful
Relays are especially helpful when the dashboard switch is not rated for the accessory current or when several devices need to be triggered from one control signal. They also let high-current wiring stay closer to the power source.
When you may not need one
A small accessory drawing very little current may be able to use a properly rated switch directly. Check the accessory and switch specifications before adding unnecessary complexity.
Protect the control circuit too
The relay coil uses little current, but its control wiring still needs proper routing and protection. Keep control wires away from sharp edges and moving steering parts, and use connectors sized for the wire rather than oversized terminals.
