Have an issue with an NPR,first showed up and found fuse was blown that supplies power to the key switch,replaced,tested and gave back to operator,10 minutes later comes and says is dead again,-51 code showing and wont reset even if unplugging the battery...after unplugging and plugging battery back in display goes from -99(maintenance code) right to -51 wont power up but even with the key off the truck will lift(hydraulics working with key off) keyswitch seems like it turns farther(12 o clock to 5 oclock) sister truck only turns to about 2 oclock. Replacing switch tomorrow and checking for cause of code. any input on what to check first?
Line contactor tips are NOT welded and all other contactor tips look good and not welded.