Little background here...Been driving this car all summer long.. Occasionally, the gas gauge and power windows wont work but everything else will. If i would giggle the key in the ignition .. the gas gauge and windows would start working again. Fast forward to Saturday. Let the oldest use it to go to work. He comes home and parks in driveway. I go to move it and i get an barely audible click when trying to start... back and forth a few times.. nothing. I checked voltage across battery terminals with battery tester.. registers about 12.9 volts and no issue..put load on the tester and it shows good. This battery is about 2 months old. Any ideas about where to start testing tonight after work? Thanks in advance.