Gold Capacitor Why does my sub amp shut off in protect mode when the car is running, but it works fine with the engine off?
I have a Phoenix Gold 1000 Watt RMS amp and two MTX 12's in ported boxes. Operates and sounds great with the ignition in the on position with the engine off, but when the engine is running the amp shuts down and goes into protect mode at a relatively low volume. I have 8 gauge wire feeding the amp less than 10ft and an 8 gauge ground less than 1ft. I have double checked all wiring for resistance and/or shorts. There is no difference in voltage at the amp either way........what gives? Would a capacitor make a difference?
Yes, runs on just the battery fine, I can use the power windows and have the headlights on and no problem. Only shuts down when the engine is running....weird...
This is a toughie... I'm wondering if there isn't some problem with your voltage rectification and regulation - check for an open diode in the rectifier stack first, and be sure your charging system is on the level.
If you find this is the case, go to a larger alternator.
Beyond that, a cap by itself might help, but perhaps if engine noise is the issue, a Pi filter might do the trick - a 50 microfarad 50 volt cap to ground followed by a 10 millihenry choke coil in series and then followed up with a 1000 microfarad 100 volt cap to ground then to the amp. It's only a few bucks and the parts are available at Radio Shack.
Note the choke won't be a little one, it'll have to pass full amp current.
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