I am a little confused here. I was told that adding batteries would assist my alt in powering my amps. So now if I add a rear battery, I am not helping my alt? Adding rear batteries are detrimental to my charging system? Why sell them then?
So if you are upset at him returning 2 perfectly good batteries, and you are sure they were perfectly good, how could it be that his amps fried due to low voltage? This could be answered one of two ways:
1) The batteries were defective and did not properly supplement the alt power.
2) The batteries were good, but are over-rated and were not adequate for powering a 3000W amp.