Hey guys please help been stuck for a week with this issue

[Hamish]

I drove a truck acting similar once while passing through Washington DC, wasn't a Pete though. Only happened to find the problem because it was dark out and I saw a hint of blue sparks where a battery cable had worn through and intermittently touching the frame nowhere near either end of the cable. I realized afterward that the intermittent issue was related to torque on the driveline and/or wind on one side and/or if I was parked in a way that torqued the frame, etc.