I put in a new alternator and a battery a few short weeks ago, and just a few days ago my stereo system started acting up.
Sound is produced normally, but cuts off entirely at a certain RPM, depending on how much electricity is being used. For example, during the day with no headlights, A/C, or defogger, the sound will cut out at anything past 1500 RPM, and will come back when idling at a red light or something.
I've found that using more electricity sort of extends the threshold at which my sound system gives out. In order to listen to anything through my speakers, I have to have on any combination of headlights, A/C, defogger, etc.
WTF.
So it seems to me, though I don't know too much about electrical systems, that the sound dies because the stereo is being overloaded with power. I checked all the fuses I could think of, and they're fine.
Any help diagnosing this problem is appreciated. Please and thank you, TR.

 

Check your grounds and make sure you connected everything securely to your alternator. Get a multi meter and check the voltage to the battery with the engine turned off and under load.

12v off
14v on (if the alternator is working correctly)

 

sounds like either a bad ground

or a tweaked out alternator

do like ^ said and report back the findings.

also get a buddy to hold the gas down a bit, hold the PRMs steady at 1800-2000 and see what the reading is.

 

oh, and do you have an amp or anything like that?

 

Actually, I have two amps.
Still getting a hold of a multimeter, but will be back soon with results.