Solving the "trailer lights" problem

Unfortunately when the Suzuki is being a trailer- hey her range is only 35 miles or so- the neatly wired trailer would blow fuses on the tow vehicle. The problem was too many bulbs. The running lights and directional signals would activate both front and rear lights on the Suzuki.

There are a number of possible solutions, but I decided to use relays. Left, right, and tail light each is activated by the tow vehicle but the power to light them comes from the Suzuki through the red fuseholder midway up on the right.

While I was doing relays, I added a fourth for an Ooga horn. Much more fun than the factory horn's pitiful beep. The Ooga comes from Harbor Freight.

Anyone know where I can get a Bermuda Bell?