Unsure what is wrong with my car.

Bad ground

Try cleaning your battery connectors whether they look clean or not.Could be a loose connection there also.If it ran good,and always started I would look there first.

try disconnecting the amp for a few days to see if it cures the problem

try disconnecting the amp for a few days to see if it cures the problem

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also make sure the amp goes off when you switch the car off.

could be bad capacitors in the power supply section , if they wont hold a charge they will just slowly **** small amounts of power even when the amp is off which will cause your discharge issues.

Ever since I have installed my new sub with LESS power from the amp I was using previously

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Just to clarify, did you put in a new amp and sub or just a new sub?

And did the problem start immediately after the change was made?

Sounds like you may have a bad connection on your battery terminal if its showing good voltage but not starting good. What does it show at the battery when you try to crank it? If it drops real low you have a dead or bad battery. 12v is a very picky electrical setup. If everything isnt perfect, youll rip your hair out trying to figure out why current isnt flowing.

With the lead acid batteries everything is corrosion prone due to the gases and different metals mixing. Pick up some di-electric or "tune up" grease from the auto parts store and put it around your terminals and wire connections at the battery. Also check your ground as someone else said.

When you turn the key. does it just click, or does it try to start, but seem as if there isn't enough juice? If it just clicks, thank either your starter solenoid is going out, or the starter itself. What kind of vehicle is it?

Clicking means there is some power in the batt but it's nearly dead... either it's not charging (should be 14+ volts while running) or something is not powering down with the car and draining the batt. If you run it for awhile and stop does it start right back up but overnight it has trouble starting? Is it random? Does it do it all the time?

U gotta start breaking down your problem.

Unplug your amp power wire. Drive normally for a day or two. If that doesn't help, we can rule out your audio equipment being the culprit and then if it isn't the amp you have a whole new world of **** to test starting with battery/connections, then alternator, then starter.

So step 1 see if your amp is what's causing this. If so, one time my ground came loose and everytime I would Wang my sub then turn off my car I couldn't start it. Simple retighetening and sanding the ground spot fixed it

alt not charging battery, my xterra did this