Now my EC240B Volvo excavator is showing no signal to EMC on the monitor. I have (in the past year) replaced the monitor and the vecu. Then had problems with it running very rough and found bad connection on the main plug to the engine wire harnest. All was good for a while and now I have to wiggle the computer over ride switch under left arm rest for the starter to crank the machine. I have the switch ordered but I'm afraid it won't solve the problem with no signal. Any suggestions on where else to look?