Hey guys. I have two GTs and I am always replacing batteries in one of them. I drive both cars at least once a month and keep them on the OEM battery charges 24/7. The car I am having problems with I just replaced the battery (OEM optima) about a year ago. Recently with. Bad weather and the holidays I did not drive it for a couple months. When I went to drive it a few days ago the battery is completely dead. I put a battery tender trickle charger directly on the battery for 7 days and it has not brought it back! So I have decided to get the point plug for the battery tender and use it now so I will know if it is charging or not. The most important thing is I want to check the OEM battery charger to see if it is working or not so I know what the problem has been. I checked the ground to the frame and it is tight. I did not take it off yet to check for corrosion! The cars stay in a climate controlled garage. I also checked the power pint fuse and it is ok. Thanks for the help guys! Chad