My old truck is giving me fits about even starting now. First thing in the mornong I have to hook up the jumper cables to another truck and then hit the key and starts right up. Don't even have to start other truck, just hook up cables. Then it will start a few times but then all I get is the selonoid clicking. Lights are good and bright but it won't turn over. Put new starter on and the same thing. Hooked my charger up to battery and it reads a full charge. Any ideas why it seems to take the extra juice to kick it over? Or could the battery just be holding enough to run lights and such but not turn over the motor? Battery is 6-7 years old, maybe a little more.