BX2200 main lights not working after shortcut

Likely a blown fuse.

if everything worked before you redid the cabin, I suspect a missing ground wire ( typically solid black)

hmm, do you have the wiring diagram for the cab ? Otherwise it'll be a real 'challenge'.

Well if you don't have a multi-meter, now's the time to get one and let us teach you how to use it. Seriously, the best of troubleshooters are in the dark without a meter.

Ssavski said:

I have one but never use it

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Many others have meters collecting dust and I understand. At first it can be intimidating but once you get the hang of it, you will never be without it. Pitch in members and let's help get this problem worked out.
The only mistake you can make is having meter set to ohms/resistance and touching probes to voltage. Correct me if this isn't true, tractor cranks,starts and runs normal. Set meter to 12v dc or lowest volt above 12. Touch one probe to + battery post and other to - post. You should see 12 to 12.9 volts. At fuse box you will notice one wire is larger than others, this wire brings 12 volts to box where various fuses sent 12 v to various devices, Put a meter probe on large wire and other probe on metal surface or - battery post. If you don't see 12v, follow wire back to a point where it does show 12v. Between that point and fuse box is a blown inline fuse OR burned out fusible link. Once you are seeing 12v at fuse box we can test between fuses and lights.