I think the armature is grounding out to the field in addition to the brushes going bad. It wouldn't show up in a bench test all the time. Hitting the starter and getting a "click" could be the short in the starter. When you have a major ground out like that it will finsih off a new battery in short order. With 130k it is time to replace the starter. Check it by engaging the starter with the dome light on in the passenger compartment. If it goes real dim this is the problem.