The running (side marker) lights, stop and tail lights were “functional”, but were missing some lenses and tended toward intermittent. Since the camper came with a set of new marker lights (not yet installed), it was decided (by me) to replace all the bulbs with LEDs at the same time the new marker lights were installed. Bulbs (#1157’s stop/tail, #194 markers, and #1141 license) were ordered from Amazon.

Replacing the markers was fiddly, only because the holes in the camper’s ABS end caps needed to be enlarged to 1.25″ to accept the new light assemblies.  Drilling out yet more pop rivets (3/16″ bit) was required. After that soldering to join existing wiring to new bulb sockets. Replacing the stop/tail light bulbs, keeping the existing lenses and frames, was straightforward.

Testing it all by cabling the camper to the pickup truck found that 3 of the four marker bulbs would not light because #194 LED bulbs have polarity and were plugged in backwards. A quick lens removal and bulb flip fixed that problem.