Ground to an aluminum hull.

[wall3y3]

Oh I probably should have been a bit more clear. I was tightening the positive and touched a screw attached to the hull with my arm. It was not a connection between the battery ground and positive but a connection (through my arm) from positive to the hull (just a little shock). Thus obviously something is grounded to the hull. My question is is this normal/okay to have something somewhere grounded to the hull or is it a problem?
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