Newman SledBed - Can't get to Wiring/Lights?

[Lake Cle Elum]

I bought this trailer new at least 10 years ago. Never even had to change out a lightbulb, but now sure how to if I needed to do it?

Now, lost all lights at the same time, obviously a "ground" problem.

I have traced the wiring to the plug that is under the trailer about 1/2 back. Have juice coming in from the truck. Connected a battery to the wiring running to the tailights, and nothing.

So, all wiring and lights are inside the boxed Aluminum frame. No access to anything......Does the ground run to each light? How do I get the lights out to test continuity of the wiring? Thanks for any insight......

 

[Blk88GT]

Do you have a picture of the trailer lights it has? If it's the usual round ones with a rubber grommet, just pry them out (carefully!) as the only thing that holds them in is the grommet!

 

[Lake Cle Elum]

Do you have a picture of the trailer lights it has? If it's the usual round ones with a rubber grommet, just pry them out (carefully!) as the only thing that holds them in is the grommet!

Thanks much - Got the lights out as you suggest. I wasn't prying hard enough for fear of breaking the lenses. Have ran a ground wire from the truck battery to the wire harness...Still, no cigar....I'll keep with it...