I have an electric 12V engine coverlift mechanism (1) that is draining the battery when ever the hatch is opened. If engine is running plenty of juice no problem (just spikes the volt gage way down) . Is this normal? Can theses be rebuilt? If I need to replace it would I be better off with an electric one or hydraulic one plumbed into the trim tab pump. The boat is 89 Scarab, battery was just replaced. The hatch has the sunpad.