u/Aintgotnolegs10

I’ve got a 2005 6415 with quite a few issues.

The glow plug light is flashing, throttle is limited after it runs for a few minutes, eventually will only idle. Battery light is faintly on and the PTO won’t turn on. When I use the PTO switch the battery light gets brighter for a split second. The dash is dead until the alternator kicks in when I rev.

New battery, alternator and starter. All fuses are good. All grounds have been cleaned and checked.

I plugged in a code reader and can’t get it to communicate, tested the resistance of the CAN Bus pins and got an OL read. I assume my issue is here, throwing the tractor into limp mode.
Any advice?