I was going through my wiring and found that I have 2 ACC wires (both blue). I found this by using that volt tool. Anyways, I couldnt locate the battery wire (BAT). I know its supposed to be the red one with the black strips, but there were 2 of those aswell, niether worked as I tried connecting the deck.
Now, the previuos owner had his own system in there with an amp and everything. I checked the battery location and there was an amp wire (on the positive terminal) going all the way to the trunk. My question is should I remove that wires along with some other plugs that are also connected on the positive terminal? Could that be a reason as to why my deck wont power up, becuase all the fuses are fine.
Any other suggestions? I did do a search on all of this and couldn’t find anything on this forum , or any other. So I’m thinking that someone here might know.
You should run your own wire from the igintion harness… stock wiring sucks! Anyway here is a brief description of how to do a basic deck install in ANY car.
Disconnect the head-unit harness.
Use a multi-meter or voltmeter…
With the ignition switch in the OFF position: check all wires coming from the stereo harness… one or more will have +12 V… this wire is the CONSTANT BATT. wire. Connect this to the thick yellow wire from the head-unit harness.
Switch the ignition to ACCESSORY: check all the remaining wires. A wire will now have +12 V that didn’t before. Turn the ignition to the OFF position, the wire should have lost all voltage. This is + ACC. Connect this wire to the red wire from the head-unit harness.
Turn on the car lights: check all wires again. Find the new one with +12V. Turn off the lights. The voltage should drop to zero. This is the illumination wire. Loop this wire back and tape it to the harness, you don’t need to connect this wire for the basic install.
Strip the ends of the remaining wires.
With a small 9V battery, test combinations of the remaining wires to find the speaker wires. When you find a speaker you will hear it “pop” and you should be able to tell which speaker it is. Select one of the wires to be positive speaker input (it doesn’t matter which one). This is now your reference speaker. The head-unit wire code is: White = front left, Grey = front right, Purple = back right, Green = back left (the rear one’s might be the other way, correct me if anyone else knows for sure).
Once you have identified all the speakers there should only be 1 left: GROUND. Connect this to the bigger black wire from the head-unit harness. There may actually be other wires depending on the car… power antenna, illumination
BE VERY CARFUL! Depending on the car, it may have a anti-theft system built into the stereo and you may hard-code the car’s computer which costs $1500 to have the dealership fix… and they are the only ones who can fix it. But if you are doing older cars like 240’s you should be ok. Beware I am not responsible for any of your mistakes or damage you may do trying to do this on your own! If unsure, leave it to a professional.