Just to demonstrate the effectiveness of using relays, before adding the relays when I turned on my H1s my voltage would drop from 13.2v or so down to around 12.7v to 12.2v
The voltage drop is due to all the wiring and contacts in the circuit causing increased resistance. The wiring goes through the ign sw, light sw, column flasher sw, and fuses before reaching the headlites! That's a lot of wire and contacts to develop resistance!
After relay install, with lights on, it stays constant at 13.2v. Enough said!!!
I agree with Quicksilver and Joe Bob on fabbing your own setup. Just bought a couple of standard
headlite relays, sockets, fuse links, and some wire, easy peasy!
Get a couple of these ,some fused pigtails and some extra wire and you've got all you need.
https://www.amazon.com/Auto-Truck-Relay-Socket-SPDT/dp/B007JPPQH6/ref=sr_1_20?ie=UTF8&qid=1470702625&sr=8-20&keywords=headlight+relay