im still hearing whine with the oem stereo back off even when its turned off..... wtf? i have an aftermarket alarm and thats it.... compustar... im so aggrivated

 

Ruled out the stock amp and/or a blown speaker?

 

Car is brand new

 

i swapped mine, and had no issues... sorry to hear about this..

 

Brand new or not, something isn't working properly. It happens. The prior page has a post with steps to take to diagnose location. It sounds to me like you've got an amp or speaker wiring issue.

 

ill have to look more into it.... i havent touched the the oem speakers or amp.

 

Guess pioneer is sending me a replacement unit and i should have it on tues.

 

I have owned several Mitsubishi's from 1990 to my present 2011 GSR. All of them have had a alternator whine. My 2011 GSR with the stock Nav unit has a very faint whine. I have notice when upgrading the head units it seems to amplify it. I had upgraded sterios on my 1990 Eclipse GS and my 97 GST. Both had the whine. Mitsubishi just has bad grounding. Try adding a couple grounding wires from the block/Alternator bracket to the frame and see if that helps. I doubt it's your unit.

 

I've done a few installs on Mitsus and have never had alternator whine, but I have heard of it happening on Mitsus more than most other cars...

OP- Upgrade your battery to chassis ground, engine to chassis ground, and don't use the ground in the head unit harness. Run your own ground to something metal like the dash support. Make sure to remove any coating or paint first.

 

Got replacement pioneer unit and still have alternator whine. WTF!

 

At least you can cross the deck off of the list. Time to start looking elsewhere.

 

Ya but ive tried everything else. I dont want to play with the amp, battery, or alternator and blow my warranty. Weird thing is i had no whine last night but did in the afternoon. Maybe its only when alternator kicks on? I dunno. Very annoyedd

 

Drove car today and whine was really loud

 

Dang, sorry to hear of the crappy update. Just thoght of something, though.. if you have a spare speaker laying around (or could borrow someone's), maybe try hooking it up directly to one of the powered channels on the new deck (and disconnect the other 3 channels and any pre-outs). If you still get whine through the test speaker, the interference is probably occuring somewhere in the deck's wiring.. and if there's not any whine from the single speaker, then the issue is probably coming in through the metra factory amp interface and/or its wiring to the deck or to the amp.

Just an idea, and something relatively quick and easy to test out. I've used a few aftermarket deck to factory amp interfaces like the metra before, and have had nothing but problems with them. So if swapping decks didnt work, maybe swapping metra boxes might?

 

Wish i had money for new harness