On Thu, 04 Aug 2011 11:49:55 -0700, Winston
wrote:

Karl Townsend wrote:

(...)

Probably good to point out the basics. I hadn't double checked the
input jumper. Its OK

Suspect a broken wire or open connection between RC4-4
and the pot on the gun.

Advise photograph existing wiring, unplug and re-plug
connections. Please consider good quality contact
cleaner treatment of connectors, too.

--Winston

Good suggestion. I'll get some contact cleaner and try this.