After I hooked up my subs and amp and drive around for like 15 min, my RPM drops to about 500 RPM (the car is barely on). hence, my need for a capicitor but I decided to disconnect power cable and now my RPM when in neutral is still lat 500 rpm. has this ever happen to anyone else and how can i fix this?

 

what kind of a system are you running?[:-]

 

Could be something unrelated. Might just be a coincidence (sp?) that it happened when you hooked up your system. Check the distributor/alternator.

 

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Dont know if this relate to it but car battery can possible b the problem. If your running assessories such as subs, neon light, tv etc your might want a better car battery that can handle it.

 

go to autozone and have them test the battery and alternator. im pretty sure they can test it in the car.

 

hey bud i have the same problem my rpm guage dances at idle if you crank on it, some amps are just current hogs, while others arn;t so bad. What they have suggested above are good ideas, but if you're worried about just get a beefier battery.

 

I think a capacitor will solve your problem for sure. Remember get a 1 farad for every 1000 watts of power your system is using.

 

same here you just need a capacitor

 

I have the same problem with the r.p.m.'s dropping while the car idles. I have an Optima Battery and a 1.0 capacitor.
I'm running a Visonik amp rated at 800 watts RMS( i know its lower) and (2) JL audio 12" subs. Do I need 2.0 capacitor ?