cant get ho alt how many farads

I just bought a High Output alternator off ebay. But I got played and it sucks about just as good as my factory. It is saposed to be 200 amps but there is no way that it can be. I never get 14 volts and it goes down to 11.9 volts when the bass hits for a while.

Well I do not want to get another one becasue I might be getting a new dodge magnum but i dont no how soon. SO I was thinking more farads for now. I all ready have 2 farrad cap it was working great for my subs until I added my 4 ch amp. now my system is strugling for power. I was thinking

20 or a 40 farad cap off ebay.  Unless you have a recomendation. They way I se it now my subs witha 2 farad cap was ok. 40 should cover it all.

My system is a RE Audio SX 15 , Soundstream CLASS A 10.0 and Hifonic Bruts 170X4 and audiobahn comps which need to be upgraded later. Im pushing about 1500 1600 watts at most.

Did you test your old Alternator?  What was that putting out?

Have you done the "big 3"?

How is your battery in the car?

Hey Kevin, have you given these people a negative feedback and contacted e-bay fraud division (if they sold you something that does not work like advertised)?

pac 200 amp relay

Take all of the above advice.  A cap, no matter how many farads capacity, has to be continually charged.  What provides the power?  The alternator.

Call some local mechanics and find out where you can take that alt for an inspection and test.  If you get someone who knows what he's doing, ask him to go over your car's wiring and make sure the factory wiring is upgraded as well as the grounds.