can someone explain this

ok ever since i upgraded my power wire from a 4 guage to a 1/0 guage my amp sees more voltage then my battery does with a dmm with the car off, now i assume it is because of capitiance

you mean it sees more voltage when everything including the stereo is off, or when the car is off but the stereo is playing ?

everything off. like when the car is off the battery will say 12.65 and then if i go to the amp and put the leads on the postive and ground it will say 12.7 then if i go back the battery will still say 12.65

MAybe the cable is holding that extra .05 volts. I dont think its a big deal i mean maybe theres a better ground back, there less resistance in the wire. Not sure but if it was like 12.6 and 13.1 then i would scratch my head.

doesn't sound right to me either but that IS a very small difference

yea i know but it is a difference maybe i found a way to harness free electricity

LOL send it to mythbusters.