Well I finally got back to this problem today. The motor, pump, and battery cables are lined up in a flat straight row and go through a 3/4 inch high slot in the bottom of the weldment plate that's behind the battery. It was like someone poured concrete back there. The only way to get at them was to remove the counterweight. I couldn't get the 2 big bolts out that secure the OHG to the counterweight. They have never been removed. They go straight up into the OHG and are in recesses in the counterweight. The longest breaker bar I could use was about 3 feet because it had to be facing forward and the front truck was up there. I got one to creak but they suffered from the battery fumes for years. So I unbolted the front of the OHG and lifted the counterweight off using the OHG. First time I ever did that.

The only way I could get the cables out was to cut one off and drill through were it went through that 1 inch thick plate with the slot in it. Then I could chip away and free up the other ones. Finally got them free, cleaned up, and replaced as needed. 2 megohms of resistance to the frame.

Five hours of labor, most of it working in battery crap, and it's fixed. It was not fun.

Thanks for the help. I did try the new scr's before the operator told me saw a 57 code when it acted up. The current sensor must have been sensing reverse polary due to the cable problems.

justinm, I'm in the Albany area.