JD 4450 warning light problem

[denjaczacemi]

The warning lights on my 4450 do not function properly. It has an "Investigator ll" monitor, and I found all connections were tight. I read about problems this system had with cab grounding. Has anybody encountered a similar problem, and maybe help me solve this mystery?

 

[Tx Jim]

Check for good connections in bulkhead at firewall(parts key 10) on RH side. Also check ground connection close to parts key 26. Also check instrument cluster grd connections.

 

[denjaczacemi]

Thank you so much for this great information! It is exactly what I was looking for......thanks also for the diagram! I will check this out for sure!