sub loses power when engine is on...

[rsport]

i have a sub and amp set up that works fine when the engine is not running, then when i crank the engine on the sub loses 99% of its power. it still moves a little and the amp stays on without going into protective mode. any hints?
i tried to get a better ground to the amp and i also tried a bigger fuse on the 12v power cable. didnt effect it.
thanks!

[failedabortion]

Rca's ran on the same side as your power wires? Engine/chassis grounds all good? What's your remote wire hooked up to?

[rsport]

rcas hook up on the opposite side of the amp as the power wires. i cleaned up the ground wires and locations when i put in my new trans. remote wire is hooked up to the head unit.

[failedabortion]

Meant Rca's ran down the same side of the car as the power wire?

Have you checked voltage at the power wire and remote in acc and run?

[rsport]

rca cables run down the middde. power runs down driver side.

i will check voltage on the two cables later today.