Any clue what this relay setup is? in Electrical Posted August 11, 2019 Thanks for the feedback w3wilkes. It is actually two horn relays soddered together. They are identical to the other relay in the picture, which I have traced to the horn. I'm thinking you are on to something with this being a potential primitive headlight relay system. I'll be breaking out the multimeter tonight to do some more testing. I'm also going through 47 years of maintenance and repair paperwork I have on the car to see if anything fits the bill.