I bought a farad cap, so my amp would get more power. Cause my lights were dimming and stuff. After I hooked the cap up to the amp some weird sounds started coming out of the subs. The noise is a real high pitched sound. What can I do to fix this?
I third it, check grounds and make sure you have good solid connection to metal, also what you're hearing is probably alternator noise, you might consider upgrading it, since it's obviously underpowered for your application, a cap is only a bandaid in the long run.
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The capacitor will do little to solve the light dimming issue. You are experiencing the problem because you are at or near the capacity of the alternator/battery power output when playing your system at high volumes. You can add the cap in if you want to, the voltage specification is a maximum voltage, so it should not be a problem. I still doubt that you will solve your light dimming problem with it though.
try taking out the capacitor and wire the amp up with out it. it sounds like the cap is back feeding or discharging voltage when it should not be . if you reinstall the amp with out the cap and noise goes away buy a new cap or do away with it .
your overloading the amp and its going into protect mode. turn the bass down on the deck or adjust the controls on the amp itself. get lower power rated sub(s) or more powerful amp since you won't be able to push the sub(s) you have with that one since the sub(s) is/are pulling too much power from the amp.
get a small led or something that runs on 12 volts. i use my 5 dollar 12v test light and hold it to the positive cable thats gonna be hooked to my cap. hook the other side to the cap, it will light up the test light and in a minute or two the light dims and then goes out, after its out , the cap is charged......JUST DONT LET IT TOUCH THE OPPOSITE WIRE WHEN YOU HOOK IT UP OR YOU DISCHARGE IT and its not funny
simple issue means your alternator is not able to supply enough amps to keep the system running properly, recommendation get a capacitor to handle the extra load, it acts like a second battery, when the alternator charges the cap it takes the load off the cap rather then the battery, so the lights and system all run with sufficient power i recommend a 1 to 2 farad capacitor for your system if it is about 800+ watts, you will notice the difference immediately
Your lights are dimming because your system is pulling too much current from your car. Your battery provides long-term sustained power, but your system wants to draw power faster than your alternator and battery can provide it. When the amp attempts to draw more amperage than the battery and alternator can produce, it creates a voltage differential in your system, which attempts to steal electricity from the rest of your system (like your lights). The most common solution for lights dimming is to add some level of adequate capacitance to your car. Capacitors store electricity and deliver it quickly to your amps as needed. Capacitors resist voltage changes by producing large amounts of amperage. This means that the capacitor(s) will provide the electrical bursts that your amps want so that it doesn't have to steal it from your lights. You can start out with 1.0 Farad, if the problem doesn't go away, add another one, and so on until the problem is gone. You cannot have too much capacitance, it's just an electrical buffer for your audio system.
If the light on the amp is dimming when the bass hits it's usually a power related problem. It sounds to be that you don't have enough power going to the amp to drive the sub. It should stop if you reduce the volume at which you are playing the music. Yes? How to solve this is to, increase the size of your power cables, add a power capacitor if needed & change the car battery to a higher capacity one. The other option a little more professional, would be to fit a split charge system & a secondary battery to the boot/trunk of your car just to run your stereo system, with a power capacitor too. This will provide all the juice that your system requires so you can bang your head as long as you want :P