Electrical issues in Cascadia?

Try another ground wire from the cab to the frame. Older trucks it's a common problem, electrical gremlins, and I'd start with a good ground.

 

What size wire would you recommend? Larger the better?

 

Describe a small static discharge, you get a spark?

 

Well, no need for a battery cable, but a good stout wire. Speaking of batteries, when a battery of 3 or 4 fails, it does weird things too.

 

your problem is only in the inverter. that inverter is just a normal one. sine wave inverter doesnt let the power surge or pulse.

 

Yes, some laptops do not get along with a Modified Sine Wave inverter.

 

16 gauge wire will carry 20 amps. 16 gauge is very common in the wiring. The desk your using the laptop on is plastic, so no grounding there. Rubbing long sleeve shirts on the plastic will generate static.

Otherwise cook more coffee. A higher humidity will lessen the ability to create a static electricity discharge.

 

You should not have any discharge at the laptop, that's why I asked my question. You are using two different isolation power supplies with a common ground that is created through the system.

Grounding it doesn't address the issue.