RidgeRelayby SKI LLC
Installation guide

From terminals to working accessories.

Follow the board map, wire the trigger side of each relay, test it at the board, then pair your phone.

Safety first.
Fuse the power feed and wire with the battery disconnected. Do not exceed 200 mA per channel or a 24V supply. RidgeRelay is not for brakes, steering, airbags, or other safety-critical systems. Follow local laws for auxiliary lighting, and do not operate the app while driving.

Board at a glance

Input voltage5 to 24 V DC
Channels8, switch to ground (low side)
Per-channel current200 mA maximum sink
Relay loadUp to 40 A, set by your relay
WirelessBluetooth LE
ControlRidgeRelay app and 8 test buttons
In-car displayApple CarPlay, Android Auto
Power-up stateAll channels off
USB-C portService only (firmware updates)
Board versionBOARDV4-B

Download the Quick Start PDF

What’s in the box: a RidgeRelay board pre-mounted in a weatherproof enclosure with a cable gland installed.

1

Power it

Feed the harness through the gland. On the power terminal, the right terminal is 12V+ and the left terminal is GND. Use a fuse tap (fuse included). Chassis ground is shared, so no separate ground run is needed for the relays.

The input range is 5V to 24V DC. The board always starts with every channel off.

Board mapRidgeRelay board mapEight test buttons and LEDs on the left, Bluetooth module at the top, RLY1 through RLY8 terminals on the right, power terminals at bottom left, and USB-C service port at bottom.BLE modulebuttons + LEDs12345678RLY1 → RLY8ground-switching200 mA max eachGND | 12V+USB-C service

Left power terminal: GND. Right power terminal: 12V+. USB-C is for firmware updates only.

2

Wire your relays

Connect one side of each relay coil to 12V+ and the other side to that channel’s RLY terminal: RLY1 through RLY8. When a channel is on, its terminal pulls to ground and the relay energizes.

Each channel can sink a maximum of 200 mA.

Automotive relay hookupThe trigger side connects 12V positive to relay pin 86 and a RidgeRelay RLY terminal to relay pin 85. The load side connects fused 12V positive to pin 30 and pin 87 to the accessory, which returns to ground.Trigger side12V+ → pin 86RLY terminal → pin 85RidgeRelay pulls lowAutomotiverelayLoad sideFused 12V+ → pin 30pin 87 → accessoryaccessory → GND
Close-up showing the RidgeRelay RLY1 through RLY8 terminal labels
3

Test it

Press a board button to toggle its channel. A green LED means the board is commanding that channel on; it does not confirm that the load circuit is working.

To verify a channel, set a multimeter to continuity or resistance and connect it between GND and that channel’s RLY terminal. On: continuity, about 0 ohms. Off: open.

4

Pair with the app

  1. Hold buttons 1 and 6 until the LEDs run a blue back-and-forth sweep.
  2. Open the RidgeRelay app and go to pairing.
  3. Select the board shown as open to pairing. It appears as “SKI Relay” followed by a short ID.
  4. When it pairs, the LEDs stream red, yellow, then green from top to bottom.
  5. No Bluetooth PIN or classic pairing is needed; RidgeRelay uses BLE.
5

Use the app

Tap a relay tile to toggle it, rename it, choose an icon, or set your dash color. See what the app can do.

Download the Quick Start PDF