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I suspect the switch is missing this jumper... Here is the OP's switch. I don't see the jumper on it..

Ah, so your switch needs a jumper or two. Terminals 2 & 4 should also have 24 volts on then in STOP. S1 terminals 2,4,6,8 need to all be jumpered together. Add jumpers as needed so you have 24 volts on 2,4,6, & 8 with S1 in STOP.

With S1 in STOP be sure S1 terminals 2,4,6 & 8 have ~24 volts DC on them.

The panel lights going out when it stalls is weird. Wouldn't think S1 could cause that.

I found a pic only showing 1 jumper. As I recall the switch has some of 2,4,6,8 jumpered internally. The external jumper completed connecting all 4 together. I had some of the switch's and that's the way I seem to recall them. edit: I found a picture I posted quite a while back and it only...

I've hit that accidentally as well as many others. You're in good company :LOL:

Use your meter and check for power at all the points I posted a few posts back.

CB1 may have tripped

Be sure you are on CR1. The labelling on that assembly in the back left can be deceiving.

What color is the back of the S1 switch? Is is square or round? Do you have a hand held voltmeter handy? If so we'll need to take a series of voltage walk to see where you are losing the 24 volts when you release S1. With the meter set to DC volts and it's negative lead connected to chassis...

Where did you check for voltage to verify " loses all power to the control panel. "?

Are there any fault lights lit after you release S1 to Prime/Run and it stalls?