Grounding your parts to the case will not help. The potential between the different metals is what is causing the battery effect, not anything to do with the unit's power supply. There really is nothing that you can do about the battery effect in the fluid except to use fluids that are electrically inert, or additives that lower the conductive potential of the coolant. Sorry.
If you're having severe viscosity problems, try a commercial surfecant if you can get your hands on one. I have no idea where to get one, though .... It makes water super slippery (drop a vial into a mall fountain and watch the fun begin as the water starts spraying everywhere ... this was once a common practical joke ... haven't heard of it happening in a while). If you can't find any, try water wetter. It doesn't work as well, but you'll notice a difference.
Rather than trying wiper fluid, try the stuff in pure plus the additive. The water, even when mixed with alcohol, will still lower the overall viscosity of the fluid. If you're going below freezing, use it straight with a touch of water wetter.
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