2003 Tib Start Problems

My 03 Tiburon V6 6 speed will not start. I jumped the car and went
directly to a local auto store and bought a new battery. When I got it
in, I turn my key to being to start the car and all my lights dim real
low/off. They eventually come back up but if I hit the brake, all
lights go off. The store brought out another battery, same type, and
the same thing happens. Cables are good, connections are good. This is
the correct type of battery for my model of car but for some reason, it
will not even build enough juice to start. PLEASE HELP. The dealership
in Abilene is HELL & I don't want to go back.

 

It sounds like a short somewhere is draining the electrical system. The
first thing I'd do is to pull the alternator and have it tested.

 

Either the batteries are discharged or there’s a problem with a
voltage drop in your car’s power or ground system. Take the battery
back to the supplier and ask them to check it. If it checks good, the
problem is most likely with the car