This way, only the upper light in the switch will work, but it will work in either position. Push the bottom of the switch in and the light bar will be on without the high beams. This way, you will push the top of the switch in and your light bar will be on with the high beams. Pin 7 is the switch earth, just earth it inside the cab somewhere.
Pin 5 is your constant 12v input, you can tap into the ignition wiring for this one. Join pins 3 and 4 together, then run a single wire into the engine bay, this will be your output for pin 85 on the relay. You can have 1 of the lights in the switch working, the catch is it will work in either position though, so at least you have a telltale that the switch is on. there's not really any easy way to have the lights inside the switch working in both positions. those switches with leds in them now are a pain in the butt. You can use a wiring loom from eBay if you aren't comfortable making your own. You can get away with just using 1 side of that switch, so pins 1, 2 and 3.
If you want this reversed, just swap the top and bottom wires around. In the "up" position it will be on all the time. Wired that way, with the switch in the "down" position, the light bar will come on with high beams. Some relays have diodes between 85 and 86, requiring it to be wired that way or it won't work, but if it hasn't got a diode, the other way will work fine too. I normally make 85 the switch input, 86 earth, 30 the +12v fused input from the battery and 87 the output. The other option here is use twin core from the switch to the relay and use the second wire straight from the battery (if doing it this way I'd recommend fusing it, a 5a would be fine, in case it rubs anywhere going into the cabin).Īs for the relay, as above will work fine. The bottom pin, if you want to be able to use the light bar with the key off (or removed from the ignition) simply wire this to a constant 12v from inside the cab. The top pin of the switch make the input from the high beam wire. I'd make the centre pin the output of the switch, wire this to pin 85 on the relay. If you want to use a 3 way switch you will get away with just the 1 relay.ĭepending on the switch you get, it will have 3 or 6 terminals on the back (if you are just using one of the metal toggles ones). You do NOT have to double up the fuses because there's only one light bar, the difference is that now you have two switching mechanisms for the same thing. Switch 1 on, switch 2 on: light bar comes on regardless of the high beam setting (because switch 2 and relay 2 are providing it with power). Switch 1 off, switch 2 on: light bar comes on regardless of the high beam setting. Switch 1 on, switch 2 off: light bar off until high beam is active, then light bar comes on. Connect the outer pole of switch 2 to pin 86 of relay 2.īoth switches off: light bar off regardless of the high beam setting. Connect the outer pole of switch 1 to pin 86 of relay 1. Now connect the two switches inner pole to an earth point inside the cabin. Connect a decent sized black wire from the light bar black wire to the battery negative.Īlmost done! Connect pin 85 of "relay 1" to the high beam wire. Connect pin 87 of BOTH relays together and connect pin 87 to the RED wire of the light bar as well. Connect it to pin 85 of "Relay 2" as well. Electrical cable (red and black) and spade connectorsĬonnect the fuse to the positive terminal of the battery then run it in to pin 30 of BOTH relays.