Volvo dash lights OUT after Qualcomm install

Just like the title says.... After getting the new style Qualcomm put in my 2000 Volvo I noticed the backlight in the instrument cluster went out... Of course I was 300 miles away at this point, which was half my fault, I should checked the little stuff like that first before leaving... The diagnostics screen, the one the keeps track of instant Mpg's and such is still lit up just fine,,,, it's just the other side that lights up the speed, tach, air pressure, fuel tank and etc that's not lighting up....

AND--------- to throw in a curveball, the marker lights are not coming on now------------

I bought a new chrome rear center panel as part of my restoration and I hooked all the lights back up and only my turn signals/brakes/ and 4 ways lit up.... No marker lights!!!! The reverse lights were not not working either....

Is it just me or is it a crazy coincidence that this all happens half a day after installing the new Qualcomm? The truck has not had a Qualcomm in it for over half a year...

So I've took off the kick panels and have tried to trace the steps back to go over his work and if I can find some type of error. I guess I will be replacing fuses soon. I tried unplugging and plugging a few things to reset the circuit, no luck there yet. I've done MUCH research on here and found these suggestions; replace marker interrupter switch, ignition switch, and it the dimmer switch..

Maybe I just need to disconnect my batteries and reset the system. I also read that Volvo uses the white wire for a ground so maybe i need to rewire my back lights and switch the black and the white wires? Idk..,,

Any help, advice or opinions would be greatly appreciated. Thanks in advance & safe trails

 

So far I've disconnected the Qualcomm,, disconnected the batteries,, replaced all the atm fuses that looked blown,, replaced the big 60 amp fuse that was in charge of the ignition fuses... Nothing yet but still trying,,, any more ideas?

Thanks

 

Thank you all who answered,, it ended up being a little 20amp atm fuse. The second row all the way to the left. At least now I know which one is responsible for all the marker lights and dash lights. Only thing is now, my new reverse lights are 3 prong and the wiring from my truck is 2 wires,, white and red,, got to find some way to make it work

Thanks and safe trails!

 

Where is this switch on the trans and how would I go about checking it? Voltmeter?