No power at all

Mattax said

Lets break that up.
If it starts up with a jumper, the key switch should be in RUN.
When you turn the key and all power shuts off, is this in Run, or Start?
Also what does the ammeter show in each of these cases?

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I think from start. Sorry. Running off memory here. When you twist to start everything goes dead and stays dead like a dead battery, but the battery is full. Go back an hour later and get a dome light again but then all goes dead when you twist to start. Jumps fine like a ground issue. Just was hoping for an ah-ha moment on here. Haven’t metered anything yet.