Hey, i am new to the electric side of the car i have spend most of my time in body work, eg fiberglass. i have recently purchased a 7" monitor, an just didnt want to screw up the system. i am leaving the original system in to play radio and cd's as this one would require me to install a cd player as well so it just seems easier. it has 4 wire's- red, blue, black and yellow. now the black is ground, so that goes to a ground screw. the red is to the ignition switch ACC, so do i follow the original systems ignition switch wire and splice into that? then there is the yellow, which is Battery which is to connect to the circuit of accumulator? not to sure with that one. last is the Blue wire, to back running switch or backing running lamp curcuit (12V is valid)??? don't no what that means. would it be the same as an accessory outlet, where i put the blue to positive of the outlet and black to negative of the outlet. not sure if that makes sense. sorry if this is long. i am new to the electronic side of the car, do most of my time under the hood or outside the car, not to much inside so if any one couold please give me clear directions it would be greatly appreciated. Thankyou for your time.
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7" monitor wiring help, 4 wires- blue black red yellow