Originally Posted by WA1DH
What's the minimum CCA that a battery should provide to turn over a 4 cylinder engine? I had read 280 CCA but I just tried a battery I had that tested 390 CCA (Ancel BA-101 tester). The starter solenoid clicks and it will not turn over. The battery was testing at 12.6v before I attempted to start it and had dropped to 12.4v afterward.
The vehicle needs at least the CCA that it came with from the factory. Or a little larger.
The best battery test is to remove the battery. Bring it inside and fully charge it. Then use a carbon pile tester to load it to 1/2 CCA until the tester beeps (15 seconds I think). Look at the battery voltage on a temp compensated scale just before you dial back the current.
If you are doing a capacitance test then you need to turn on headlights for 10 seconds before testing if the battery just came off a charger or was driven to remove a surface charge.
Consider looking at cables, clamps, connectors, grounds to loose or corroded wire/connectors.
Measure voltage across battery while cranking and on starter to ground while cranking. If there is much difference you have some kind of loose or corroded connection or starter solenoid issue.