I have an alternator whine and turn signal popping playing in my speakers and i cant get rid of it. It was good for 3 years then i put a new amp in and i get the whine, remove the amp that was just introduced and it DOES NOT go away.(Gotta love systems) So i re-ran all the wires, finally seperated my rcas from power wire, redid my ground, and i swear the more legit i make it the louder the whine gets. So I assume it has to be the ground, Right? Im not familiar with a multimeter but from what i read on the internet i set it to the 400 ohm setting and measured from the (neg of battery) to the ground of hu, (neg of battery) to the point where my amp is grounded and from (neg of battery) to point where the battery itself is grounded.. all these values were the same.... 6.5 to 7 ohms... i read it should be below 4 to be a good ground. is the ground good/bad or is there something wrong with my battery? Im at a loss any help would be greatly appreciated

 

Please list the equipment involved. How old is your battery?

 

sounds like a ground loop issue on the ground of your rca's through the headunit (pico fuse in pioneer decks) ground your rca's and see if it goes away. another way to check is to unplug one set (or one) of the rca's and see if you still get the whine.

 

Currently im just trying to get a pioneer deh-p680mp headunit, kicker zx350.4 and some pioneer 6x9s working clean. Using a bk test bench 388a DMM (dont know if you needed that info) The battery is at least 3-4 years old, with no reason to suspect that it is bad, i always have strong starts on cold days and never needed a jump.

 

I am using a pioneer HU. just tried unplugging one of the rca's and the issue DID NOT go away. I havent tried to ground the rca's yet should i still try that? if so should i ground it to the HU, the Amp, or both? Ive seen both ways online.