Renting an older home and upon moving in was saddened to see outlets without grounds (two prongs). So, for one of the outlets I bought a 2 to 3 prong with ground clip and ran the ground to some vent duct work (resistance was less than 20 ohms per recommendations I've read). After plugging in surge protector (ground light turns on) and plugging in a two pronged TV, everything works, however, I was surprised to find that my voltage detector picked up energy on ground. It's not 110V, but its something, not 100% sure how much because my meter is broken.
Is this normal? Is this just the surge protector should bring extra fluctuations down the ground? The strange part is this only happens when I actually plug a device into the surge protector.