Navi head unit/ amp and sub question

**bode** · 10-31-2009 10:35 PM

So I fixed the speakers popping, it was the ground behind the head unit. There is still alternator humming, and I am almost positive it is from the power wire behind the steering wheel. So question number one is where else can I tap into power that turns off and on with the car...The other situation is I am only getting 4 volts of power to the amp..I tested the battery, before, and after the fuse, and everything is normal. I just figured it was a bad ground, so I sanded down part of the frame and put a bolt through it nice and tight...still only 4 volts (my friend was testing on the allen bolts that crimp down the power wire on the amp.)

**htfan** · 11-01-2009 09:09 AM

Originally Posted by bode

... So question number one is where else can I tap into power that turns off and on with the car...The other situation is I am only getting 4 volts of power to the amp..I tested the battery, before, and after the fuse, and everything is normal. ...

What year and model do you have?

Your questions should have already been answered in earlier posts (above)

... If you have a B7 (2005.5+) or newer, then the switched 12v for the HU is provided by the CAN-BUS.

You can tap other locations on the vehicle, but it is problematic as you have demonstrated.

**bode** · 11-02-2009 09:11 AM

sorry I have been running around in circles with this and everybody has been telling me diffrent things.

I have a 2003 a4 quattro. It had some old car phone from the previous owner, that was hacked up and replaced with a parrot bluetooth, which has wires EVERYWHERE (I am removing the carphone and bluetooth). So I have been finding random harnesses and wires all over the place. But there is no power behind the headunit, at least power that is made for the headunit. I was told to tap under the steering wheel.. this works but has feedback. I just need a cleaner power source. Id rather stay away from more harnesses and more money. just a clean power wire that goes on and off with the car, with no alternator noises or anything of the sort.

**htfan** · 11-02-2009 10:25 AM

Originally Posted by bode

sorry I have been running around in circles with this and everybody has been telling me diffrent things.

I have a 2003 a4 quattro. It had some old car phone from the previous owner, that was hacked up and replaced with a parrot bluetooth, which has wires EVERYWHERE (I am removing the carphone and bluetooth). So I have been finding random harnesses and wires all over the place. But there is no power behind the headunit, at least power that is made for the headunit. I was told to tap under the steering wheel.. this works but has feedback. I just need a cleaner power source. Id rather stay away from more harnesses and more money. just a clean power wire that goes on and off with the car, with no alternator noises or anything of the sort.

I thought the B6 provided a switch 12v wire in the HU harness? Oh well! We'll have to ask other B6 owners to chime in...

Sorry to hear the previous owner made a mess of your harness.

**htfan** · 11-02-2009 11:59 AM

Just found this post in the B6 forum... this should help you - some good info here!

http://www.audizine.com/forum/showthread.php?t=175690

**bode** · 11-02-2009 06:53 PM

Thanks! that helped with some other problems too, like the auto-dim. Audi's are so confusing to me!...or maybe its just because it is a newer car. As for power, seems like most tie into the ignition, which is where i did it, or the homelink....since the ignition is giving feed back, looks like I will have to try to find the homelink power wire..

+rep for helping me out.

I noticed you lived in OC, I keep trying to find excuses to move that direction! or find a solid job out that way.

**htfan** · 11-04-2009 08:41 AM

Originally Posted by bode

Thanks! that helped with some other problems too, like the auto-dim. Audi's are so confusing to me!...or maybe its just because it is a newer car. As for power, seems like most tie into the ignition, which is where i did it, or the homelink....since the ignition is giving feed back, looks like I will have to try to find the homelink power wire..

+rep for helping me out.

I noticed you lived in OC, I keep trying to find excuses to move that direction! or find a solid job out that way.

Glad the other post helped.

Atlanta is beautiful too! I've spent a lot of time in your town. Many trade shows and conferences. One of the companies I worked for had a training facility there so I would be in Atlanta weeks at a time.

Wait a little to see when the job market picks up in OC... right now we have record unemployment