Cat 320D weird issue with machine

[V10THUNDER]

I would say that is unlikely unless the machine suffered a direct lightning strike.

The usual reasons for ECM issues such as you describe are any combination of: -
1. Welding on the machine without disconnecting the batteries - and the ECM as well if you happen to be me. I prefer to play it safe.......
2. Not placing the welding ground right next to the location of the welding work.
2. Condensation/water entry into the ECM.

Any combination of the above will often result in an extra-crispy ECM.

on the spot that this machine was working, high ground on a hill...could have been that, although on that quarry of ours magical stuff happens. so I will probably never know. this storm was also during a weekend and nobody was there.

 

[Nige]

Points 1 & 2 are well worth reinforcing to your maintenance guys, especially the welder(s).