I am starting to have some problems with my GHS system. This is an older walker, '96 model. I used to have problems with the ground inside the catcher, but all I would have to do is remove the screw and clean the contact surface a bit. No dice now. I let my brother use it for about 3 weeks while I was out of town, so not sure when it starting failing. Neither swinging motor of alarm is working. Question is, where are some common places to loose ground/power along the path. I am about to buy a 12V tester, but needed a place to start. Also, it seems I am losing a little bit of hydro power sometimes. Is this an early warning sign of something, or just older mower?