lil help here?

aright 2 questions: 1st.........i wired up my own head unit about 4 months ago.....it all went perfect, nothing wrong with it at all...... so about a week ago my friend got her parents old truck and wanted to put a new head unit in it.......so i did it for her.......my only problem was that there were no labels on the old wires like there were on mine.......i kinda had to guess and i figured it out through trial and error (no voltometer in my house).......well last night i asked her how it was and she said that every time she turned it off, the settings went away, which basically means i screwed up the constant power wire right????.......its an 87 dodge ram 50........if you have any past knowledge any help would be appreciated........

2nd: for the same truck.......all it has is some 3 1/2's up front under the windshield...... then once i get my job at bestbuy i was gonna hook her up with a sub and amp, wires....all that shiit...... my question was..... since those are the only places for speakers, she prolly wont get many mids only highs and lows......and her parents wouldnt let her do any custom work to door panels or nothin.....soooo.....is there any 3 1/2's that are 3 or 4 ways????.....cuz the 2 ways arent gonna cut it.......cuz i have 2 ways all the way around....and i need some 3's or 4's cuz my system sounds bad........ aright....any ideas or knowledge would be appreciated.......