Look to see if the parking lights are working... if not, then I have a good idea of what is wrong...
See, I had some blue LED license plate bolts that I put on the rear... Well, got pulled over 3 times and the last time the lady made me cut the wires on the spot.
Didn't think much of capping off the wires, but anyhow, few months later, my car started blowing the ignition (IIRC) fuse under the hood. Anything that was tied to the ignition switch would not work.
I ripped just about all the wiring apart on the car in the street in front of my house (after we used my mom's 85 Delta 88 to push it home).
Finally, I, for whatever reason, decided to see if the wiper motor was causing it (was the very last thing I hadn't looked at). Pulled off the driver side cowl cover (the black thing under the wiper arm), and saw a long red wire that was all melted and sticking to the body.
Turns out this was a fusible link for the parking lights, and for reasons unknown to me, they decided to put it in with the wiper motor.
Cut it back in front of where it melted, and all the problems were solved, except that it had no parking lights, dash lights, etc.
Stripped back the wires and put a wire nut on, BAM... the ignition fuse blew again... so now I figured out it was the parking light circuit, so started tracing it out and came up to the trunk area and saw the wires hanging and melted to the trunklid...
Cleaned those off, connected the wires back up under the cowl and I was golden!
Hope it helps
EDIT: you might not have the exact symptoms since I had a direct short, and you just have an additional load, which might have just burned through the fusible link, where as mine was completely melted and shorting out the circuit, which blew the big fuse ahead of it.