Hi, PAoutdoorsman,
Yes, I still have my AMZ66.
My machine does not have any relays in the upper control box. It has the same device in your photo that is partially hidden behind the wires in the upper left side of the photo but I think that is some sort of alarm.
I'm wondering if this relay is related to some sort of deadman switch on the upper control panel that must be held closed to allow the control to work. A pushbutton or toggle switch that you have to hold while operating a function? A photo of your console might help as I can compare it to my console layout.
A lot of time has elapsed between the time these machines have been built and possibly safety laws have changed to require both hands to operate controls- one hand on the deadman switch and the other controlling the function.
Are there any wire numbers on the wires running to the relay? All of the wires in my control box have wire numbers printed on the cables every inch or two. Alternatively, trace the wires from the relay to where they connect on the console or to the circuit board.
I have a shztload of documentation on this machine including wiring diagrams but it seems to me that Grove made changes as they were building them so you need to match the serial number to the drawings. They also treated the circuit boards as black boxes so chasing a problem to a black box can be frustrating (and costly)
My machine still has problems as described in my earlier posts on this thread but it still works from the ground controls so I run it with a groundsman around. And if the controls don't work on the ground we are adept at taking a nail or welding rod and poking the correct hydraulic valve up the butt to MAKE it work! We just haven't had the time to get right into it and do some serious troubleshooting.
I still hope to get my machine back to 100% operational and I'm willing to bide my time to do so....I have a secret weapon to help me here, called a son who is trained in electronics so we will attack it through a slow winter and maybe simply trash the upper and lower control boards.
The only thing these control boxes do is combine the signals between the 4 "porportional" controls in the basket and the ground into a single pair of wires. (Porportional= pull a control lever a little, the action moves slowly. Pull a lever a lot, the action moves fast.) So all this complication just eliminates a few extra wires running through the boom.
Please feel free to ask if you need clarification or want me to see what I have for a wiring diagram of the upper basket. And let me know how you make out!!
Jon.