Helping my guide friend get his cat running again. He's got a PB 240 D. Thought he had a dead battery or starter (Not positive on the symptoms, I came in after the fact.) Anyhow, Put 2 new fully charged batteries in connected in series for 24V. When he connected the positive side he welded the wrench to the terminal for a few seconds Now when we turn key we don't even get accessory power. No gauges, lights, buzzers, nothing. He says this is a new symptom. He does have the cab raised a few inches. Is there a master switch or main fuse somewhere perhaps? Thanks for reading.