Anybody out there, have this issue with there boom lights. Boom lights worked fine for a few years, now, boom lights come on, when clearance light switch is turned on. Concord is the brand of pump. MRU chassis.

Check all the grounds.

Rookie,  we had the same problem with our 40m concord and we found the problem in the turret. The wires for the boom light and running lights are running together and they rub together for a connection.  I would look there.