Power touch mover problem

I would suggest that your battery is failing.

Can you get it properly tested?

If it's not the battery, then there's probably a dodgy connection somewhere.  I had a similar problem with our last van and when the engineer turned up he found a loose connection on the post that the negatives from both control boxes were connected to. I know you said you've checked the connections but I'd have another look - all the way from the battery to the motors.

Remove your battery and take it to a tyre/battery supplier and ask them to carry out a load test on the battery, this will then ascertain if the battery is faulty. Good luck.

A battery will show 0v if its terminals are short circuited (not a good idea because the shunt will get very hot very quickly). The load imposed by your motor mover is considerable, though most definitely not the same as a short circuit. But the mover load will cause a lower voltage when it’s working. Electric motors create their highest load when stalled, with a decreasing load if they are able to run freely. Your mover’s motor may be restricted in its rotation due to a lack of lubrication, rust or a number of other causes. You might do well to run them without touching the tyre, by way of a diagnostic test.

My guess is that the battery is at fault.