Replacing a single pole hurricane lantern switch? I replaced a single pole light switch. When the switch is...

I replaced a single pole light switch. When the switch is bad the tester still has a giddy glow at the oil lamp fixture wires. Also, if one lead is attached to the white wires contained by the switch box, and the other lead is touched to the metal facade of the switch, I get a full brilliance on the tester. Is it a bad ground? Are wires touching somewhere? The electric wiring in the switch box is as follows: the whites are connected near a wire nut. The blacks are attached to the switch. The grounds are pigtailed together and attached to the switch ground screw. Thanks for your time.
Answers:    http://www.ehow.com/guide_12-home-garden...
The electric wiring you described is correct. The hot (black wire) goes into the switch and later on to the light, the nonpartisan (white wire) bypasses the switch and goes directly to the pale and the grounds are connected together. You can cause a shine on some testers with static electricity, so if it is just a faint luminosity just take care, keep the wired cap until you attach them one at a time and you should be fine.