1. Choose a location on the transom 6 to 12 inches beneath the waterline. The mounting surfaces should be flat, clean, dry, and free of existing hardware or holes. Check inside the hull for wiring or obstructions.
2. Before mounting, ensure that the light will not interfere with the operation of engines, trim tabs, rudders, etc. Clean the gelcoat or remove any bottom paint from the gelcoat surface. Mark the light center and drill the appropriate hole (0.5"). 
3. Spread a generous bead of sealant (3M4200 or equivalent) around the inside surface of the light bezel, the screw holes, and the wire stem up to the exposed wire.
4. Feed the light housing through the hole and orientate using the logo on the reflector. Fasten in place with tape.
5. On the inside of the hull, apply the supplied rubber stain relief plug to the wire. Apply a generous bead of sealant (M4200 or equivalent) to the plug and into the wire through-hull hole before installation of the plug.
6. On the exterior, tighten the screws hand-tight with a screwdriver (do not use power tools as you may snap the bronze screws).
7. You should see sealant expelled from around the light housing to ensure adequate bond. Wipe off any access sealant.

TIP: To minimize electrical noise and interference, running the positive (red) power and ground (black) return together for as much of the wire run as possible, ideally inside a jacketed cable, is recommended. Avoid loops and coils of the wiring.

• Ensure that the circuit you are connecting to has no power. You should turn off your house battery and test to ensure the circuit is not energized by using a multimeter before continuing.
• Run a marine grade 2 conductor wire from the light to your switch. On a 12vDC system, your switch and fuse should be rated for 3A maximum (2A @ 24vDC). View wire gauge reference chart HERE.
• Connect the wires from the light to the new wire run and follow ABYC standards. Ensure that the wires are crimped correctly, and use a heat gun on the heat shrink of the butt splice connectors. TIP: Splice the red and orange wire in an easily accessible location at the light or switch.
• Verify the switch is a Single Pole Single Throw (SPST) switch; it has the appropriate Amp rating and is connected to house power through a properly sized fuse. 
• If connecting the new wire run to a switch, connect the red/orange wire to the normally open side of the switch and the black wire to the vessel's common ground.
• Turn on house power and test the new underwater light.