<human>: I bought my SO's grandpa's old pickup truck about a month ago and it's still in fairly good shape and has low mileage so I couldn't pass it up. There is a problem somewhere between the door alarm and the ignition switch that makes the stupid thing ding incessantly. I decided to correct the issue by simply cutting the 12V constant that is wired into the switch on the door. Problem solved right? As suspected the annoying dings went away immediately and I was happy with the result. Or so I thought. When we left to run some errands in the truck I now noticed that the interior cab lights don't come on but figured it was due to the truck now thinking the door was in a constant closed state. To make matters worse the radio is no longer working and the speedometer is not doing a goddamned thing. I have checked all of the pertinent fuses and everything seems to be in order. I have no idea what could have caused those things to malfunction if I only cut the door wire. I have since re-soldered the wire back together however nothing was corrected by doing so. I still have no door alarm, lights, speedometer or radio. The radio itself kinda works though, it appears to have power but the display won't show the time/station and it has a static sound when I turn it on. The truck is a 93 Ford F-150. If anyone has any ideas on what I can try to troubleshoot next and get it corrected I would be most grateful. I really don't want to spend my whole weekend trying to unfuck myself. Help me r/TIFU, you're my only hope...

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Cut one wire on the door switch and now the speedometer, radio and interior lights won't work and the fuses all appear fine.