Been meaning to share this diagram on how to use 2 relays to make the negative headlight Toyota harness to work for positive headlights (LED).
To recap, the harness existing has 1 positive going to each side, seperately fused after it goes through relay. It has a negative going to each side for high and a negative going to each side for low.
Really simple. get all 6 of these wires located coming out of the firewall harness. You only need one of each of the negative wires for high and low.
Put one of each positive wires to terminal 30, that will make power go to the headlight when triggered. Also put power on pin 85 of one side to power the coil and a jumper to the other relay. Thus the opposite side of that, terminal 87 will be the wire going out to power low or high for both bulbs. Thus you have switched from one fuse powering one side to one fuse powering both low or both high.
The original input negative needs to go on line 86 on one of the relays and in my diagram, pin 85 on the other. Thus when either wires have ground input, the circuit is completed and pin 30 is connected to 87.
To be clear, in this setup, because Toyota harness has both high and low as negative (ground) when the brights are on, both the high and low beams are powered, which is how my LED bulbs work.