Should I ground my RCA shields?

I installed my amps & crossover in back of my truck’s seat. I have a whine that is related to the engine rpm(s). I thought it was coming from the alternator and installed a 150 amp alternator filter and I still have the whine. I made my own RCA (large stranded center w/ copper shield) cables and suspect the whine is from the ignition. Should I ground the RCA shield? Is there something that can be done as the stereo sounds great with the engine off .

thanks

First of all, are your speakers running of the amp? Or is your amp just running a sub? Like Squirrel said, power line and RCA's should be running on opposite sides. There was a video in school that had David Navone and Richard Clarke talking about alternator noise. They all sourced from the grounding points. The farther away you put the grounding point the less noise was visible. So try making your own ground and running it as far away from the alternator as you can. Hope it works.

Thanks everyone that replied .....

I ran a 18” 1/0 ground to the truck's frame with using a grounding block within 12" of the amps (that are located in back of my truck's seat). Then I ran a 9" long / 1 1/2 wide cooper braided bonding starp from the seat's mounting bracket to the same amp grounding block to bond the truck's body to the frame.

In my attempt to use More's Law ("If enough is enough, More is better, too much is just right") I think I created my own problem.

grubby