Thanks guys for all your input. I've solved the problem. I had an automotive type relay installed between the PS and Duet that certainly did the job of taking the bed heater current drain off the board, but it was noisy as heck as it approached the set bed temp. Removed the relay and wired bed heater straight to the board...problem solved.

Thanks. I got similar answers on another forum. I will wire hotend separately.

I have a 24v, 40w hotend. Can I safely connect to rg45 and cat6 cable? Amps of hotend is 1.6a.

@Veti I have new cables coming....check back on this post next week. Thanks everyone for all your help so far.

@Veti
green/yellow: 2.4 ohm
red/gray: 2.4 ohm
measured directly on motor pins
rechecked at board ends.....no ohmage (sic).....bad crimps or break in wire someplace?

@Veti I get no reading on either one

@Veti my z wiring is the same, and it functions fine.

@Veti https://i.imgur.com/kQ5BBjJ.jpg

@Veti yep, that's my stepper. i still cannot get the image of my board wiring to upload. both were jpg, taken at the same time. anyway, my stepper wiring at the board, from left to right is red, gray, yellow, green.

@Veti i couldn't get one of the images to load...still working on it. I'll reload the one that did load.

@Veti standard folgertech nema 17, 1.8 degree. 5kg/cm, 1.5a20191106_095244.jpg