Stop in for a cup of coffee

What's the light? Not that I can troubleshoot it, but I've had a hard time killing them.
And is this just a plain 'ole Chrysler ECU?
Not sure what's wrong, it's a very old chrome light that my dad gave me years ago. The light is at least from the mid 70s

It is the stock type ignition ( I use only original parts or original appearing)

I connected the light and it lit up and was working for a few minutes then suddenly went out and I tried wiggling wires and fiddled with it for like 10 minutes and it never came back on..... then I ran out of time and to start putting everything away for the night