My 2003 Honda Accord use to die on me occasionally and when I reset the cable on the battery just readjusted them it would work after a few tries. It would show a decent amount of power and the relay box would click and not start but this was only occasionally. As of recent the car has been dying out and the battery won't charge. The lights slowly dim and when they din the gages stop reading until it stops running all together. We replaced the alternator which I don't think it needed now that it's stil not working. Got a new battery and tested them they both work right and it's still not holding power or charging the battery. Any advice or suggestions?

 

Start with checking or replacing the ground from the engine to the chassis.