No, that's not normal. There shouldn't be anything attached to the positive battery post except for the cable going to the solenoid. If you are losing 1 vdc between those two points, then there is a problem with the connections at the battery. The most obvious is the cable between the battery and the solenoid, but the ground cable could be the problem too. If you still have a corrosion problem at one of the cables, REPLACE THAT CABLE, and wash the battery post with a mixture of baking soda and water. The battery post will foam and bubble when the baking soda/water mixture is brushed on. This is normal, and means there is battery acid present. Keep washing it with the mixture until the bubbling stops.
Take care,
-Chris
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