I have 2 bazooka el 1500 amps and i would like to know what gauge wire I should be using?

Look at fuses first. Then if they are ok. You need to check wiring. Ground. Power remote. If those are good. You need a tech.

why aren't you running rca's from the deck to your amp?

Parallel will give you higher output but if you're hooking up all 3 you better use some very thick wire.Are you hooking these up to amp(s)?Sounds like a fuse is going to blow eventually too.
Good luck bro'!

bet the resistance of the speakers and the amp do not match, 8 ohm speakers don't work wit a 4 ohm system

make sure your wiring is correct.. negative to negative positive to positive.

remote wire is the blue wire maybe has white stripe that runs into stereo run from there to remote on amp as far as bass knob remote its common 1/4 stereo jack or a phono plug (looks like a phone jack)

The amp needs a remote signal to turn on. This is provided by wire from the back of your head unit. Also look for a 'REM' or 'remote' connection on the amp (besides the 12v and ground connection).

Look at the wiring/setup diagram for your head unit to determine which wire/connection you should use for this.

If the head unit does not have a specific 'remote' wire, you can usually use the power antenna wire to provide a turn on signal to the amp instead.

The advertised wattage for your amp is:
300 watts RMS X 2 @ 4 ohms
600 watts RMS X 2 @ 2 ohms
The actual wattage you will be using will depend on what type/impedence speakers you are using, and how they are wired. Here's a link to some more of the specs of your amp:
http://www.bazooka.com/productAutoAmplifiersRS.asp?id=199
I hope this helps.

Sometimes the Bazooka tubes have an internal amp. I am not sure of this model but maybe you can Splice in directly to the Speaker Wire and bypass the AMP in the Tube if it has one