I guess I'll have to take to shop, Because I don't know what all is aftermarket and who to get the circuits back to stock.remove all traces of the aftermarket crap, restore all circuits to stock.
You are right, battery is old. It actually died when I tried to start it a month ago. Took it off and recharged for several days with Optimate 6. It was ready next morning but I had no time for it so tester maintained/charged according to its program. Starter turns very well now but nothing else happens.How old is your battery? Have it checked.