Ron Dickey wrote::oops: after reading these above statements I am beginning to think I got the wires backward.
they came with no instruction...
That's easy to do, and a likely cause. Fortunately, it's also harmless... the wires have to be corrected the right way for the lamp to work, but it isn't damaged by hooking it up backwards.
The "-3" part of the model number means "bulk packaging"; maybe that's why no instructions. Just a 1960 (or 1960A for amber) is apparently the regular packaging.
Ron Dickey wrote:...it is a light 1960-3...
That's on page 37 of the Truck-Lite catalog. It says "Designed at 13.5v, .050 amp", which means it is a normal 12V lamp (and it takes 50 milliamps at the design condition of 13.5V, less current if lower voltage, more if higher).
"12V" is rarely actually 12 volts...
Ron Dickey wrote:...and it plugs into 19726 in most lights the ground is grounded through connecting to the body or frame and the lead is the hot.
on this unit the base has a black wire coming out and where the bolt is is where the brass strip wraps around. I assumed that was the ground...
That's strange... in the catalog model 1960 has a "Standard plug termination", which looks like two common bullet connectors protruding from the back. I didn't find 19726, but Truck-Lite has many harnesses, and some certainly do have a wire with a ring terminal (likely for "grounding" to the body), and other wires with plain ends.
It is not apparent to me in the photo what would prevent the wiring harness from simply being plugged into the lamp in a reversed position. If it were reversed, then you could be using the wires for their intended purposes, but still have the lamp fed power backwards - which doesn't work with LEDs.
If 19726 is like 19721 (a mounting kit on the same catalog page as the lamp), then it might make sense that the lamp could plug into the mount the wrong way up, and thus have the connections reversed.
The Model 19 series of mounts and wiring are - according to the wiring harness catalog - for incandescent lamps, which don't care which wire is which (as long as they don't accidentally cause a short to ground). They are using them for some LED models, which may open up the possibility of getting the lamps backwards.