My 2003 Buick Ultra has a battery drain that no-one can find.

What is your question?

My 2003 Buick Ultra has a battery drain that no-one can find. If I touch the battery with cables or a jumper box, it fires right up. I never know when it's going to happen. Sometimes 1 jump will take care of the whole day. Other days it can be more than 1. If I unplug the factory amp in trunk it lasts longer sometimes.

What makes this problem better or worse?

It's random

How long has your 2003 Buick Park Avenue had this problem?

A few years