Sub cutting out only when I drive

Thanks for all the help guys. My alternator started to make funny noises a couple weeks back, and after a few days of that, the headlights, gauge lights etc got a bit brighter. The windows and wipers are a lot faster as well. It could be that my alternator is messed up or sumthing huh? I'll try various things tomorrow, like connecting jumper cables to another car and see if it's still weird. (That should tell me if it's the alternator, right?) BlakeI'm trying to learn... trying.

You either need to measure with a meter or get a buddy who works at an auto shop to put a diagnostic load test on it.  But remember, you said the other amp is working fine.  So it can't be too wacky.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Definetely check the output on the alternator, it sounds like the voltage reegulator let go and is charging at too high of a voltage.  Usually when they let go, they don't charge at all, but some times they will overcharge.  And from the information about the lights being brighter, and things running faster than they used to, more than likely this is what happened.  Just out of curiosity, is the other amp the same brand or different?  If different, this is maybe why it doesn't affect that amp.  Good Luck.If it don't fit, Force it.

If it breaks, You needed a new one anyway!