30 year owner of 92 w/25k miles that runs great, but have a likely self imposed lighting mess. About a year ago I crossed the subwoofer power leads.(with the key and radio on!) and blew the stereo which also blew the ignition switch and around that time lost right taillight, left turn signal, all side marker lights, dash illumination, glove box and rear license plate. Deleted the stereo and replaced the Ignition switch and still no lights. Since we are on the last gasp of parts, I decided to throw parts at it (for spares)and replaced the lighting combo switch/signal cancel switch/dash rebuilt by MITA/dash brightness controller below instr panel/dash brightness control on firewall, ICU in drivers footwell, lighting and taillight relays/both taillights and bulbs. Had our best local tech put in a few hours to no avail except headlights and neither taillight now work (argh). So I decided to start on the taillight circuit as power was not getting to #38 taillight fuse. So after testing the new relay of course, I jumped the taillight relay(underhood fuse box hot relay term to relay term going to fuse #38) and got the left taillight back which sort of led me to thinking of a switch circuit issue although all that is new except the hazard switch and the alarm control box. When I also jumped the headlight relay I did get headlights. So to my question: up to this point I’ve ignored the alarm system but after looking at the schematics it seems to tie into about everything, including even the stereo. It is still working properly but I have not done the full diagnostic yet. I was hoping to avoid this system to simplify my diagnosis, but do I need to get into this system or can I ignore it for this lighting issue? Any thoughts to improve my diagnosis greatly appreciated. Pic of my relay bypass attached. Thanks!