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Hello sir hi, the black wire is standard color for ground. if you are wiring a speaker, the wire is really not that sensitive, interchanging the wire only makes the sound drop to about 2%, barely not noticeable.
I suggest checking what ohm load you're presenting to that amp. go to www.the12volt.com and find the subwoofer wiring diagram and choosing the amount of subs you have on it and then the impedence of each one. you're probably sending too low of an ohm load to the amp this would cause it to go into protection quite frequently and eventually stay in protection.
Well you have a high impedance path to your amp. If you have an inline fuse that should have blown. Car batteries don't have a current limiting feature HA The only explanation would be that the amount of current passing through the wire is causing a large voltage drop due to a large impedance. What gauge wire are you using? Here is an example.
18 ft of 8 gauge wire would have to be passing about 400 Amps of DC current to yield a voltage drop of that magnitude. The wire would melt and all hell would break loose. So there has to be a break in your wire somewhere.
If you have the Kicker model number 06CVX122, with dual 2ohm voice coils, they can be connected to a mono amp at 2ohms. First jumper the voice coils in series, the dotted positive (+) to the undotted negative (-) (or vice versa). Each sub is now 4ohms. Then wire both of the remaining positives and negatives together on the amp terminals (in parallel). The amp sees a 2ohm load. Here's the diagram:
If you have the Kicker model number 06CVX124 with dual 4ohm voice coils, they cannot be wired to present a 2ohm load. They can only be wired as a 1ohm load (too low for the amp) or as a 4ohm load (at reduced power). Here is the diagram of the 4ohm wiring:
You will need the following: A power wire (preferably 4 or 8 gauge) with an inline fuse (typically 50amps) A battery terminal adapter to connect the power wire A signal wire to let the amp know when the stereo is on RCA audio cables to connect the amplifier to your stereo A ground wire for the amplifier (again 4 or 8 gauge preferred)
Walmart sells a Scosche kit that has all of the wiring as well as a basic diagram for about $25, but it does not include the battery terminal adapter.
If you have a factory stereo you won't have RCA ouputs, so you will need a line level converter. A basic one like the Scosche SLC4 usually runs in the $20 range. You splice into your speaker wires and run them into the unit, then plug the RCAs into it.
If you let me know your model number of the sub, vehicle make and model, and brand and model of headunit or CD player you have then i can provide wiring color codes, recommended wire routing locations, etc...