switches that shock

I have fast bags on my truck with 8 1/2 valves with 4 billet switches. When ever you push one switch while touching another it will shock you or if you push two switches at once. The switches are wired correctly. The switches are not grounded now, but if you ground them they shock you worse. I installed two relays for each switch and that almost got rid of them problem, so I took the relays back out. I then put diodes in line on the power coming in and ran a new power wire, helped a little, then added diodes on each wire coming out the switch to each valve. That fixed it to a point. I can now touch another switch while pushing onw without getting shocked but can't push two at the same time. No one I talked to has seen this or can fix this. Sorry for the long post.

Sounds like something is wrong. Is there any of the wires touching the housing of the switches? How about switching to plastic switches and relays?Certified Security Specialist

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 This is from auto loc. Im not running rev polarity so they told me to hook it up like the bottom pic.

I have 12v + on the in and then out push up goes to my fill valve and out push down goes to my dump valve.