MT347 Cab 0.0 Volts on console

[Retired South Texas]

I have a 2021 MT347 Cab tractor with 1500 hours. Shut down in the afternoon after cutting hay. Tried to start up after a few days and all accessories came on but no start. Console indication of 0.0 Volts as in picture attached. I have checked every fuse I can find by removing and testing with continuity meter. Also checked across fuses for open fuses. Disconnected the battery overnight and connected a different battery in it's place. Removed and cleaned the two main fuses by the starter checked for voltage downstream after replacing. Still no start. Any thoughts?

 

[alexpops]

How about the main 100Amp fuse at the + post? Ground clean at both ends? Both can cause voltage problems if resistance from corrosion.

 

[alexpops]

My XR4150 did the same thing until I replaced the battery cables/main fuse set-up. I used Milspec terminals/#2 Copper Welding cable/closed copper lugs/dielectric grease/heat shrink/and ANL 100 amp fuse block to replace everything. Had similar situation as you & in my case it was due to corrosion at the 100 amp main fuse & the wonky set-up LS uses on their +cable.

 

[Retired South Texas]

Thanks, alexpops the information. I'll try changing the cable setup.

 

[Retired South Texas]

Update:
Back in business. Problem solved. Found a broken wire on the Main relay coil going to the ECU. Spliced in a new wire all is good. Thanks, alexpops for your help pointing out the grounding issue. It stirred the old brain cells to check the grounding system.

 

[alexpops]

Good for you & congratulations. For what it's worth ... the LS's are notorious for lousy ground connections & some bad battery cables (internal corrosion problems). So... keep that in the back of your mind anytime the tractor starts acting weird.