Hi Tom,

Well I have really clean looking wiring now. No AC near DC. Didn;t help a lick.

Here is summary of several experiments. Perhaps this will help you help me.

1.
Turn all on fresh
-Run all axes init
-jog X,Y,Z multiple times.
-Playing with Jog speeds.
-While jogging Z fast X,Y
-Started making soft "dunk dunk dunk dunk" sound.
-X,Y all RED on axis screen
-channels 8,9,`10,11 show current at -16 amps or so (SnapAmp#A).
-X,Y axis now dead.

2.
-Turn all on fresh
-Run all axes init program.
-jog X,Y,Z multiple times.
-run homing routine. (moves Z then X then Y)
-Halfway through Z moves, X axis (SnapAmp#A)overloaded and the bumping sound started.
-after just a moment it stopped, went back to normal and the homing program completed.
-run homing routine again.
-near end of Z moves X and Y (SnapAmp#A)overloaded again but stayed stuck.
-interestingly, Z was still able to jog fine.
-X,Y dead.

3.
-Turn all on fresh
-Run all axes init program.
-run homing routine again.
-near end of Z moves X and Y (SnapAmp#A)overloaded again but stayed stuck.
-interestingly, Z was still able to jog fine.
-X,Y dead.
-same as last homing try

4.
-Turn all on fresh
-Run all axes init program.
-run homing routine again.
-Exact repeat

5.
-Turn all on fresh
-Run all axes init program.
-Homing (X->Z->Y) this time.
-X homed fine
-During Z moves, X,Y went into overload same as before.
-channel 8,9 were showing -32.xxx amps! It continues to show that even when motor power supply is turned off.

6.
-Turn all on fresh
-Run all axes init program.
-Homing (X->Y->Z) this time.
-X, Y homed fine
-During Z moves, X,Y went into overload same as before.
-channel 8,9 were showing 20.xx amps! CH10,CH11 32.xx amps. It continues to show that even when motor power supply is turned off.
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SWAP SnapAmps
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7.
-Turn all on fresh
-Run all axes init program.
-CH4 immediate overloaded now on (SnapAmp#A)

8.
-Turn all on fresh
-Initialize and enable only CH4,Z-axis.
-immediate Started dunk, dunk, dunk of Z axis (SnapAmp#A)
-Even though CH0 was not enabled or initialized, its bar on the axis screen showed half current for 8-10 seconds
-Z Axis full red X axis back down to zero.
-another 20 seconds, all axis in the RED.