My GTI sets on hoist covered most of time. Occasionally when I hit start button I get a clicking in engine area I presume starter. Eventually when starter switch is repeated several times I hear it trying to turn over like its stuck then she fires up , same routine as if low/dead battery. I have cleaned the key switch and always get the test chirps when key applied. New battery pulling proper power. My guess is ground, starter and corrosion somewhere???? Advice appreciated. It is a 1994 model.Thanks,happy boating.