I need to buy a 2 doors sensors, a hood sensor and a trunk sensor. I have had 4 Car audio systems lifted from me. its time i upgrade my alarms. I know i will have to use diodes or something to hook these up to my input wire to the alarm unit but i need to. also a backup batter. can someone help me with ideas/instructions? right now they open my door hold the door sensor down(this disables the voltage sensor) then pop the hood and disconnect the battery. or so thats what i think. so please H-T help me. dont flame about a search i searched door trigger/sensor alarm sensor... blah blah.... Thank u ahead of time.