I rewired my spotties after I put in a new headlight wiring harness
Here's what I did
Since putting the new headlight harness in, my spotties decided to stop working, I initially had them wired through the high beam switch connected to the yellow and orange wire.
So I did a search on here and came up with nothing (surprised) I did a search around the net and came up with the following solution!
If it doesn't work the other way.
Splice in two wires at the original headlight plug.
"I don't know the colour of the wires but if you have a look at the plug there are two pins that run parallel to each other, splice a wire into each of these. To test you have the correct wires, put a test light across both of these wires it should light up when high beam in on only.
The 3rd wire, going by SimHilux is the Red with a Green strip, we do not use this.
For now, connect the end of these two wires to terminals 85 and 86 of your relay.
The rest of the wiring for the relay is the same as the drawing, terminal 30 has B+ via a fuse and 87 connects to the spot lights.
Check the operation of your headlights and spotlights , the spot lights should only come on with high beam and go off when low beam is on or the headlights are turned off.
If ok, disconnect the wire at pin 86 of the relay, double check the operation of your headlights.
If they are still functioning correctly run another 2 wires into the cab and connect to your spotlight switch. At the relay connect one wire to terminal 86 of the relay and the other wire connect this to the wire you previously disconnected from the relay."
Now this worked slightly different for me because I have the twin headlights, so you just plug the 2 wires mentioned into the high beam light connector.
Also as I upgraded to new wiring it was also easier for me as these old connectors are not use for the new wiring loom.
Now this worked perfectly me, if it works for you excellent.