horrible

Im having some strange starting problems. Sometimes the car can sit for a month or two and will start right up other times it won't and I have to jump it I replaced the rear battery. Just now I went for a ride in it I had to jump it I drove it for like 20 miles on the interstate stopped to get gas and I had to jump it I'm not sure what's going on here when I got home I put a little trickle charger on the start (front) battery and it was green which means it's good. I checked it with a voltmeter and had 12.6 V I'm not sure if there's a sensor somewhere or relay that's causing problems any ideas?

horrible

after sitting for a couple hours I went in the garage and when I turned the ignition on it
showed a red battery on the dash.
I tried starting it and it started right up??
shut it down and tried it again and it started
right up again???

moretech

I'd load test the starter battery somewhere, got to be sure it has plenty of life in it. Battery problems can be so tricky to diagnosis. But the test is usually free and you can't beat that.

horrible

Thanks, that's what I did.
The battery had half the amps it should have

I purchased an identical one at Advance Auto Parts.