where is the ground from the head unit? what does the top right thingy say? try writing on paper and taking a pic and posting it here because this just looks like you had a siezure while writing this. and id say double check your ignition wire that its not connected to the battery instead
lol what was your running speed? you should usain bolt that mofo runnin 36 down the sidewalk! could you technically still get speeding ticket? or like wreckless op?
bro i have the same problem stock alt big 3 rear kinetik and stinger voltmeter. driving today with music totally off it was bouncin around from idle (14.1) down to 13.6 then 13.3 it even dropped into 12's the the stinger said "LO" then shut off for a second and amp went into portect for a sec then voltage came back up to normal for 5 min
its recommended to cover it all in a mesh or pvc pipe and use grommets where you drill through the car if you had to.cold winter might have effect on wires but if so it will be the same effect as to your amp and sub inside all you gotta do is play 1/4 volume-ish to begin with let it warm up a little bit
wire actually can get to a couple hundred bucks. dont forget your length of 1 run and factor in extra runs of wire and big 3. you dont wanna go cheap there make sure its quality wire. fuses and fuse holders rape your wallet at shops so factor that in unless you make them yourself... expect up to 40$ per fuse holder. 10$ per high amperage fuse