alternator
 

Sometimes when I start the beast up it slowly cranks but will always turn over. Then my amp gauge will bounce from 11-14, no matter if I'm driving or sitting. Also, if I pull back on the window switches (window already up) the headlights and interior light will dim.

I've got a red top that is 3 years old, and also have a large amp/sub.

My question is do you'll think its the alternator or new battery??

If it is the Alternator, should I replace with stock or upgrade to a large amp?

Re: alternator
 

I would check the voltage output right at the alternator, and also have the battery load tested. It sounds like the alternator is starting to go.

As for the bouncing, does it happen to coincide with big bass hits from your amp/sub? If you have a big amp and sub it can put a big draw on the system when it's trying to punch out the bass. It is possible that the alternator is not putting out the power it used to, and now you are seeing this effect.

Re: alternator
 

Thanks,
found the problem.... battery was dead....."key stuck in the ignition"

New battery...everything is working just fine