Where was the lose connection? I am having same issues with my 4720i.Update...succesful attempt at wire tracing. I found a connection right above the problem deteriorating cluster connection of wires that had electrical tape on it, I. exposed the connection and for whatever reason it had worked its way apart. I reconnected the wire and now have lights. Came in for a break to update the problem is solved, I have to go back out and put everything back together. Glad I will have more years of use for my tractor, was getting close to dammit wrench tossing...