Engine Quits when Instrument Light Turned On

[johndduvall]

I acquired "Tinker" about a month ago. I've been sorting things since that time. It came with a 12v negative ground system. While test driving the other day, I twisted the instrument light on and the engine began to quit. Turned it off, the light went off and engine came back.

Before I take the instrument panel off, any ideas what would cause this to happen?

Thanks!

John D.