93 ranger cabin power loss

Just recently picked up a 1993 4.0 4wd Ranger and as soon as I made it home it failed to crank. Linked it to the ignition switch but now the truck appears to have no power to the cab. I’m not sure if the horn is supposed to work without the key being turned but I’m wondering if this can all be linked to the ignition switch or if I should dig deeper.

Also help on how to read the engine codes on it would be nice since it’s obd1 and I’m having trouble finding information online about how to scan it.