Sorry for the late response, but 67Dart273 gave an excellent answer. At least with your relays, it would have fried wires only to the relay, or the relay itself, and they only cost $5 and can get anywhere. One advantage of standard auto relays is that you can swap them to say fix your lights, but give up your horn, if stuck far from home. Good you have the big headlamps. Try finding the small ones used in 4 lamp cars like my Newport and 300D.
Speaking of batteries, I replaced 2 in the last month as did a son on another car in our fleet of 7. When I suspect they are no longer holding a charge, I let Autozone test them in the parking lot. I was right both times. One was a gold-top <3 yrs old, so free replacement. The other was their cheapest Duralast, but 10 yrs old (a personal best). I started putting a Battery Brain on all my cars several months ago, after being stranded. Saved me from further strandings 2 times already, and helped identify those problem batteries.
