Sounds like a bad connection at the battery, If it jump starts o.k. then you a bad connection at the battery! Make's sense? Or a bad battery, never been a fan of interstate battery's I use to sell them and they were junk then.
You a fan of Optima? This is my first classic. Never had to give the battery much thought. Just bought the best at the store. It’s show car quality. Just trying to get it running right. Very new to this. This site is very helpful.
