Ok, here is my trouble. OEM head unit with a RE Q 5 and a Boston Acoustic amp. I have installed a sub and have rear speaker (JL AUDIO) running off amp, everything else OEM. the rear speakers have a whine when truck is ON. Even with RCA's pulled, amp has whine. Any ideas?

 

Where did you ground your amp at?

 

My amp grounded into the body where one of the stock 09' amp holddown bolts (under rear seat) went thru.

 

hmm I'd probably move the ground to a seat bolt.

 

Yeah I'd move the ground.

Is the whine coming from your speakers? Or is the whine coming from the amp itself?

 

ok, did that and it has reduced the whine to where I can now hear it only when RCA are hooked up. I have the REQ grounded to the metal frame down underneathe the console. It did the same whine when connected to the OEM radio ground. I replaced out rca's and also put in another amp to check and I still got the same results. Where is another good grounding location at the front of the truck?

 

My amp is under front passenger seat grounded to the seat bolt.

 

I am having the same problem with mine still. 2008 screw moved grnd to the frame an did all the checks and balances we are going to try a add on noise supressor to the alt there is one in there fronm the factory that might have went bad. Because everthing else checks out ok. At this point we have had the truck apart twice nothing was found we changed rca's moved grnd and checked all componets in the system we even replace them with other componets amp hu diconected eq no luck. I f this fixes the issue I will post it on here. It has been nothing but a pain in the A$$. Like I tiold everone that helped with my post my installer has been doing this for 20 years same system in my f250 no noise isssues so wtf running out of options

 

Just one of those things bro, like the Bermuda triangle. It's there, we know it's there, just don't know why.

 

I too am still having my problem. I took advice and grounded amp to the frame with same results. I bought PAC-1 grounding device for RCA and that had no advice. The problem is occurring through the back speakers only. Is anybody else running an amp to their rear speakers (on NAV system) and if so, where do your amp speaker wires plug back into the harnass. Could these be some kind of feedback issue????