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now for the fun part, load testing to verify, sure is fun to blow the cobwebs out. the 005 in this video is still on an offgrid ranch in montana, with who knows how many hours. https://youtube.com/shorts/eYIebmttjZs

So along long time ago in a land far far away, I had an 805b that was the red headed step child, always throwing a fit, never working when needed. I ended up removing control coupla, removing backplane, all of the components from back plane, air blower cleaned, inspected sockets, pins...

so that thread is for you to learn mpu testing, adjustment, removal installation and provide a way and part numbers to get you a new one if needed. The OP never responded if it was fixed or not, you could ask the OP @GIJoeCzar if he got it running, that thread took from May to Sept to work thru...

here is a thread to read thru for the Magnetic Pickup Unit, MPU https://www.steelsoldiers.com/threads/mep-805b-no-power-to-the-adc100-electric-actuator.178809/

that is a 12v charger, 12.4v on 1 battery is acceptable, as long as both batteries are the same

Has the machine ever ran correctly? where did you get the machine? video of an attempted start? like @Guyfang said, magnetic pickup.