12 volts but no power. Cheesy chassis ground?

[davez26]

1991 Coleman Roanoke
Low options - 2x ceiling lights and a furnace. Converter for Shore Power for same.
We used this for a year or so then into storage for 5 years and back out.
Fresh battery.
First run - no problem. Everything works, some clean, lube, etc. Driveway time, no problem.
This weekend - no DC. We lived with it. (We are still shaking it down, so we expected something...)
Battery 12.5v, inline fuse good, power at fuse @ converter 12.5v. Power at light socket 12.5 v. Whaaa?
Wiring at battery power side, crusty, some copper exposed and blue (corroded), but what struck me was the ground, which seemed like an after thought.

Picture not showing, but it is roughly a rusty sheet metal screw on a ring terminal to the chassis.
With power showing 12.5, I think I have this nailed with a fresh length of 12g wire, ring terminal, ground washer, an actual bolt, and some shrink connectors.
Going to refresh the power side as well.
This seems almost to easy, but I know a clean circuit is a happy circuit-am I missing anything?

 

[swordfish]

Just to state the obvious. Has the kill switch for the 12v been fully depressed? I assume it is under the kitchen galley like mine. The drain hose could prevent the switch from being depressed all the way.

 

[davez26]

I have no wiring in the sink area, except for a run to the furnace. No kill switch.

 

[bupkis]

little sanding and re-install!!!

as a hyperlink
https://docs.google.com/file/d/0B6fnSjTrT1RFOGo1dnhKZmhkV0k/edit

as an insert img

 

[swordfish]

To state another obvious, do you need to switch between 110v to 12v at the converter?

 

[speckhunter80]

You have 12.5 at the light but no light....sounds like a bad bulb to me.

 

[bupkis]

I wonder what the voltage drop is under load with a crusty battery and the crappy ground?

 

[real lite virgin]

A bad ground will certainly cause the problem. If you have battery voltage on the ground side of the circuit then that is your culprit. If you have no voltage on the ground side than a bad bulb or a faulty light is the cause.

Rob