I have a 2003 Honda Element 2.4l. Over the past few months it has been acting kinda weird. If I drove the car daily the car would start no issues at all. But if I left the vehicle sit over the weekend (Friday night to monday morning) unless it's nice and warm outside it would need a jump by Monday. I tested the battery and it was giving me 12.4v.
So this Monday I went out to start the vehicle and got a couple of cranks and then nothing. It was a chilly morning so I hooked it up to my jumper, nothing. I then purchased a new battery thinking maybe it was the problem. The new battery brightened all the dash lights and the headlight worked great but the car won't turn over. No clicking or cranking at all from the starter. When someone watches the serpentine belt it does move a tiny bit when the key is turned to start.
Thinking the new battery was bad I took both batteries to batteries plus. The ran them both on their tester. The new battery has 750 CCA and the old battery 350. Could this be a starter issue? Is there a test I can run? I do have an OBDII bluetooth module I can install to take readings, will that help me any? Any help would be appreciated.