Hmmmmm. I will double check (after a deserved drink) n check again....
Just to make sure..... Pull green wire off (key on)... Volt meter leads hooked how? Black into green wire n other lead to + battery?
Worth a check again, but now it might make more sense if your hand control board was shorting out.
But to check unplug green wire and put positive lead on the wire and ground on the battery ground with the key off and key on should be zero volts with the rip. Then try hitting the start button and you should then see the +12v just for as long as the button is pressed, once you let go of the start button should see the meter hit zero again.
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