Originally Posted by Joe Romas
Both my factory stock 2007 Silverado and 1999 Casita
use that "unused center pin"
for the backup lights
If I or another were to use it for ground I'm afraid the blue smoke would come out somewhere
I made the decision that having a good ground for lights, battery charging
and (someday) brakes
, was important 100% of the time, and the need for back-up lights was less than .1% of the time, and took the back-up light
lead off of the plug. I then made that pin a redundant ground on the TV side and in the trailers harness.
My back-up light
is the LED porch light
on the back of my, rear entrance, Hunter, but anyone could simply add another porch light
back there for the rare occasions it is needed.
And, if I plug another trailers 7 blade plug in that has back up lights connected, no problem, they just won't work. In the world of electrical
common sense, it seems a little odd that the big pin in the middle is used for the smallest load and not for the ground, so I changed that and have two grounds.
And, if for some far fetched reason, my trailer should get connected to another TV, all it will do is blow the b/u light fuse in the TV, no smoke, no mirrors. And, I believe your 2007 Silverado has 4 separate fuses for the trailers lights, 1 for brakes
and a 50 amp guy for the charging line, all courtesy of GM. (Small plug for GM's)
Forgot to mention, my Hunter didn't have back-up lights anyway so to moi, it was an unused pin.