I have a 2022 F150, hooked up to the battery I have a train horn, lights and a subwoofer setup on 1200w. But even with all this disconnected I still have the issue of about every warning light popping up on the dash all at once, losing air conditioning and power steering while driving.. I’m not sure where to start with diagnosing because I’d love to avoid the 140$/hr fee at the dealership.

 

You own a computer system on 4 wheels.
Must get all codes present to even know where to begin.
Then understand the system and why.
The coding will be prefixed with B, C, P and / or U codes. These prefixes are different parts of the system all connected to Busses for communications between them.
Suspect the Dash can't communicate with any of them.
Consult a Ford DTC Code discription list and begin the chase from them.
See why dealers are sometimes needed, and a Tool with capability to read all the codes.
What else have you done to the truck?
Good luck.

 

nothing much else done to the truck, we cleared 147 DTCs earlier. I’m not too knowledgeable with the computer side but I know my electronics well.

 

Can you offer something about all the codes and why they were set and are there any left not cleared.
Possible you have not saw the B, C or U codes set?
Good luck.

 

147 DTCs????

 

Not saying you didn't, but did you disconnect the negative side of batt before adding any of these things?
Something I've said many times, because it's worked for me whenever the electronic crap, takes a dump,
Try a KAM reset. Did this happen right after you added something electrical?

 

now that I’ve thought about it, I haven’t disconnected negatives especially when rewiring the amp. And I’m not sure what a KAM reset is. But all of this still happens with electronics disconnected from battery

 

KAM, Keep Alive Memory, reset: disconnect negative batt connection, turn on headlights to drain any residual power, let sit for 15 minutes or so. Turn offlights, reconnect. I won't say that will cure all ills, but takes minimal time, and free. It will also reset your trans shifting, and maybe radio presets, but no danger of screwing up. KAM reset has helped me a couple times with electronic problems.

 

Did you plug into the truck's systems or run your own wiring to all the accessories. If you piggy backed on to the truck, that's where your problems start. You need to give those extensive systems their own protected electrical connections to the battery.

 

Get a Diagnostic readout for codes, then we have something to work from and doctor you back to good health.
Can't work with a computer system that has ability to accurately see >its own faults from failures or outside influence<, any other way.
Good luck.