I'm restoring a 79 Burro
13. I was checking the trailer lights
today and everything looked good except for one tail light
; small round red lens on passenger side about eye level. Popped off lens, touched the bulb and it came on, then off......loose conection. I took bulb out, tried to tighten the spring metal bulb holder, then ....pop. No tail lights
or running lights
Must have blown a fuse. Don't know where to start looking. All the other trailer lights still ok. Tow vehicle is Nissan Xterra with aftermarket hitch and flat four connector. The tail lights on Xterra are ok. Don't think there are any fuses in Burro
. Where would the fuses leading to the trailer cable likely be? Any suggestions?