@dc42 Thanks, I'm glad I helped find a bug.

Thanks, that was so simple. When I was first reading about it I was confused on the wiring and didn't want to risk shorting the board. Read it again and it was easy. The + goes to an active 5v pin, I just used pin #1, and the ground goes to the PS On. Can't get any easier.

I have a heated bed with its own control separate from the Duet. I'm trying to use an Arduino type controlled power switch to turn the bed off when the print finishes. I was hoping to use M42 and one of the extra pinouts but can't figure out how to do it. I need the signal to default to low and switch hi to turn the strip off. I've been trying with the heater 4 pin and configuring it using M950 but I really have no idea what I'm doing. Any help would be appreciated.
Here's a link to the power strip I'm trying to use. Thanks.

https://www.amazon.com/Iot-Relay-Enclosed-High-Power-Raspberry/dp/B00WV7GMA2/ref=sr_1_1?dchild=1&keywords=power+tail&qid=1584116358&s=electronics&sr=1-1

@dc42 Thanks, I'm glad I helped find a bug.

Power resurrect seems to only work in relative mode. There's a hidden setting in Cura under special modes to enable relative extrusion that I used. Everything works great with this setup. There's no need to have M83 in the startup script or the config file.

I went back to try absolute mode. Put M82 in the config file. Had Cura set to absolute. After power fail M82 was written into the resurrect file but the same issue of the continuous extruder run happened.

@dc42 it's extruding continuously. I'm going to test things today with relative extrusion.

Here's a small example of the Cura gcode file.
;FLAVOR:Marlin
;TIME:18405
;Filament used: 59.2988m
;Layer height: 0.4
;Generated with Cura_SteamEngine 3.6.0
M140 S60
M105
M190 S60
M104 S215
M105
M109 S215
M82 ;absolute extrusion mode
G28 ;Home
G1 Z15.0 F6000 ;Move the platform down 15mm
;Prime the extruder
G92 E0
G1 F200 E3
G92 E0
G92 E0
G1 F2400 E-2
;LAYER_COUNT:426
;LAYER:0
M107
M204 S5000
G0 F4500 X248.378 Y275.919 Z0.3
M204 S500
;TYPE:SKIRT
G1 F2400 E0
G1 F1800 X248.249 Y277.157 E0.1242
G1 X248.208 Y277.936 E0.20203
G1 X248.247 Y278.714 E0.27976
G1 X248.366 Y279.484 E0.3575
G1 X248.563 Y280.239 E0.43536
G1 X248.837 Y280.969 E0.51316
G1 X249.183 Y281.667 E0.5909
G1 X249.6 Y282.326 E0.66871
G1 X249.859 Y282.672 E0.71183
G1 X250.356 Y283.297 E0.79151
G1 X250.872 Y283.882 E0.86934
G1 X251.445 Y284.41 E0.94709
G1 X252.069 Y284.877 E1.02486
G1 X252.738 Y285.278 E1.10269
G1 X253.444 Y285.608 E1.18045
G1 X254.18 Y285.864 E1.2582
G1 X254.939 Y286.043 E1.33601
G1 X255.355 Y286.107 E1.37801
G1 X257.597 Y286.39 E1.60349
G1 X257.168 Y286.955 E1.67428
G1 X256.763 Y287.621 E1.75205
G1 X256.429 Y288.325 E1.8298
G1 X256.407 Y288.388 E1.83646
G1 X256.309 Y288.5 E1.85131
G1 X255.861 Y289.137 E1.92902
G1 X255.664 Y289.488 E1.96918
G1 X255.336 Y289.836 E2.0169
G1 X254.863 Y290.455 E2.09463
G1 X254.735 Y290.664 E2.11908
G1 X254.433 Y290.939 E2.15984
G1 X253.914 Y291.52 E2.23757
G1 X253.689 Y291.831 E2.27587
G1 X253.504 Y291.963 E2.29855
G1 X252.918 Y292.477 E2.37633
G1 X252.476 Y292.954 E2.44121
G1 X252.467 Y292.959 E2.44224
G1 X251.802 Y293.366 E2.52004
G1 X251.182 Y293.838 E2.59779
G1 X251.059 Y293.954 E2.61466
G1 X250.055 Y294.228 E2.7185
G1 X249.314 Y294.472 E2.79634
G1 X248.729 Y294.734 E2.8603
G1 X248.332 Y294.471 E2.90782

@T3P3Tony Commenting M82 was part of my trouble shooting with firmware 2.04RC4+1 and it had no effect. I don't think I enabled M82 with my test since upgrading to firmware 2.04. I'll try today. I don't have absolute written in my gcode start but Cura puts it there by default. I can try with M83 in my start code. With a bowden setup which is better to use, relative or absolute? I also have a Duet rotating filament sensor that keeps fasly triggering. I tuned it like the instructions said. Would absolute effect that? Thanks

Still happening. Here's my resurrect-prologue.g

G28 X Y
M116
M83
G1 E4 F3600

Here's the resurrect file it's writing

; File "0:/gcodes/CCRv310S5_dog v1 03.gcode" resume print after power failure at 2019-11-06 14:05
G21
M140 P0 S60.0
G29 S1
T-1 P0
G92 X169.296 Y230.157 Z0.300
G60 S1
G10 P0 S215 R215
T0 P0
M98 P"resurrect-prologue.g"
M116
M290 X0.000 Y0.000 Z0.000 R0
T-1 P0
T0 P6
G10 L2 P1 X0.00 Y0.00 Z0.00
G10 L2 P2 X0.00 Y0.00 Z0.00
G10 L2 P3 X0.00 Y0.00 Z0.00
G10 L2 P4 X0.00 Y0.00 Z0.00
G10 L2 P5 X0.00 Y0.00 Z0.00
G10 L2 P6 X0.00 Y0.00 Z0.00
G10 L2 P7 X0.00 Y0.00 Z0.00
G10 L2 P8 X0.00 Y0.00 Z0.00
G10 L2 P9 X0.00 Y0.00 Z0.00
G54
M106 S0.00
M106 P0 S0.00
M106 P1 S0.00
M116
G92 E242.80960
M82
M23 "0:/gcodes/CCRv310S5_dog v1 03.gcode"
M26 S118639 P0.900
G0 F6000 Z2.300
G0 F6000 X169.296 Y230.157
G0 F6000 Z0.300
G1 F1200.0
G21
M24

Here's my config File. I know it could use some cleaning up.

; Configuration file for Duet Maestro (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Mar 22 2019 16:57:23 GMT-0400 (Eastern Daylight Time)

; General preferences
G90 ; Send absolute coordinates...
;M83 ; ...but relative extruder moves

; Network
M550 P"Big Square" ; Set machine name
M586 P0 S1 R5003 ; set Http avtivate network Port 5002
M552 P0.0.0.0 S1 ; Enable network and acquire dynamic address via DHCP
M554 P10.1.10.1 ; Gateway
;M553 P255.255.255.0 ; Netmask
;M552 P0.0.0.0 S1 ; Enable network and acquire dynamic address via DHCP
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

M918 P1 E4 ; enable lcd 12864

; Drives
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S0 ; Drive 2 goes forwards
M569 P3 S0 ; Drive 3 goes backwards
,M569 P4 S0 ; Drive 4 goes backwards

M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
;M569 P2 V60 ;stealthchop 78mm Z default v118
M92 X80.00 Y80.00 Z400.00 E411.00 ; Set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200 ;default e1200.00 ; Set maximum speeds (mm/min)
M201 X750 Y750 Z100 E4000 ; Set accelerations (mm/s^2)
M906 X800.00 Y1100.00 Z800.00 E800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y-20 Z0 S1 ; Set axis minima
M208 X508 Y528 Z500 S0 ; Set axis maxima

; Endstops
M574 X1 Y1 S1 ; Set active high endstops
;M574 Z1 S0 ;duet wifi Set active low end-stops

; Z-Probe
M574 Z1 S2 ; Set endstops controlled by probe
M558 P9 H5 F120 T6000 ; Set Z probe type to bltouch and the dive height + speeds
G31 P500 X-20.42 Y-17.76 Z1.29 ; Set Z probe trigger value, offset and trigger height
M557 X20:480 Y40:460 S40 ; probe from X=10 to 190, Y=10 to 190mm with a mesh spacing of 20mm ; Define mesh grid

; Heaters
M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B4138 R2200 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
;M305 P1 T100000 B4138 R2200 ; Set thermistor + ADC parameters for heater 1 seemecnc
M305 P1 B4725 C7.060000e-8 ;e3d
M143 H1 S280 ; Set temperature limit for heater 1 to 280C

; Fans
M106 P0 H-1 ; Part Cooling Fan
M106 P2 T50 H1 ; Heat sink fan

; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

; Other settings
;G29 S1 ; Enable automatic bed mesh compensation
M572 D0 S0.10 ; Enable pressure-advance of 0.10 seconds
M915 X Y S10 F1 R1 ; Enable stall detection for X and Y axis with a sensitivity of 10 and report only
M915 Z S0 F1 R1 ; Enable stall detection for Z axis with a sensitivity of 10 and report only

:M591 D0 P2 C2 S1 ;Filament sensor, extruder 0, sensor type 2, Z endstop, enabled
M591 D0 P3 C3 S1 R70:130 L26.24 E3.0 ; Duet3D rotating magnet sensor for extruder drive 0 is connected to E0 endstop input, enabled, sensitivity 24.8mm.rev, 70% to 130% tolerance, 3mm detection length L24.8

M911 S21.3 R23.0 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Automatic saving after power loss is enabled

; Custom settings are not configured

; Miscellaneous
;M501 ; Load saved parameters from non-volatile memory

M501 ; Load saved parameters from non-volatile memory
G29 S1 ; Enable automatic bed mesh compensation
;G91 ; relative positioning
;G1 Z10 F6000 S2 ; lift Z relative to current position
;G1 S1 X-415 Y-415 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
;G1 X5 Y5 F6000 ; go back a few mm
;G1 S1 X-415 Y-415 F360 ; move slowly to X and Y axis endstops once more (second pass)
;G1 X250 Y200 F6000 ; move X and Y to the bottom left corner of the bed
;G30 ; Do a single probe to home our Z axis
;G90 ; Make sure we are in absolute mode
;G1 X200 Y200 Z5 F6000 ; Move to parked position

T0 ; Select Tool 0

I'm having issues setting up recover from power failure. After a power failure I call M916, Everything heats and moves to the right place but the extruder keeps extruding and just sits there. Here is my sys/resurrect-prologue.g file. It's a Duet Maestro and I'm using build 2.04RC4+1.
G28 X Y
T0 P0
G10 P0 S205 R205
M116
M83
G1 E4 F3600

Here is what I have in my config file
M911 S21.3 R23.0 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000"