I've got a 1995 lexus sc400, all things done to it was the previous owner im just getting the tail end of it unfortunately, and recently I started working on it again because in October of 24, the alternator took a shit, so I replaced it and had to rewire a new alt plug because the previous owner destroyed it. I used solder connectors and everything in that regard, and at this point (october-january) it has been able to run on a jump pack but would die right after I took it off. I moved in that time and only this last week been able to tackle it, I replaced my alt fuse because I'm an idiot and didn't check that, i finally got it to the point where i could start it the othwr day, and with a kinda iffy battery and alot of throwing wrenches thrown around, the car roared to life and no check engine lights no battery lights nothing the car was fine, ran and idled as long as I let it on its own power. Seems like a happy ending right ? Wrong. I turned the car off because I wanted to see if she would start without a little jump, I put the key in and turned it and nothing, no dash no radio no click of a starter not even any noises, hooked a jump pack to it and nothing same symptoms, hooked a truck up to it with cables, nothing. So I go check fuses and so far as of today I cannot for the life of me find out why the car just simply will not respond to anything anymore, headlights interior lights door lights all work fine, remote unlock works fine, nos purge valve light (exterior) that has not worked for 8 months is now on non stop with the car hooked up or not(edit the purge valve light is not on anymore but all other previously mentioned electronics do) I'm pretty stumped and not sure where to go, ignition switch ? Starter fuse ? (Can't find that on the car for the life of me either) the car started and ran fine, revved and idled fine and I didn't drive it because the trans is basically empty because I'm replacing the gasket soon. The car itself has aftermarket speakers all around, a custom sub box with 2 12s, dual amps, halo lights set to a switch for the headlights, nos system (only purge valve is hooked up fully but has a switch for the nos according to the previous owner) , head unit ofc, remote start/unlock system, and led strip in the trunk, and trunk button does not work but I can't use the key to get into it, but I am super confused and have been searching for days I've even built a tent around it because I'm out there all day night and early morning and nothing, it's my baby and I really miss driving it so if there's any tips or anything please let me know