air conditioning whine after 2 channel amp install

familycar · 07-31-2007, 03:04 AM

my ac whines when ever the foot is on the gas on accelerate or on the brake. i had a sub put in before powered by a 2 channel 400 watt amp, but there where no issues before. now i got another 2 channel amp put in to power the front 2 speakers and now ive got this whine in my AC, anyone know about this, the installer thought it was a grounding issue but he did some tricks with the ground to no avail.

suorum · 07-31-2007, 09:53 AM

The installer was right.........that's a grounding issue. Now, solutions...there are tons...
1-You can start checking the ground connections
2-Isolate the AMP from the chassis (i.e. rubber stoppers between the amp and the backseat)
3-Purchase some ground connectors.... cardomain offers them...good prices and brands (I use the Stinger ones)

You did not probably hear it before because the sub works at low freq. Anyway you should have that "whine" even without the AC. Just pay attention to that....NO VOLUME but HU ON!

Hope you solve this man.........it is a CPA!!!

awashko · 07-31-2007, 10:57 AM

Is it an A/C issue or alternator?

janaka · 07-31-2007, 12:06 PM

what kind of HU are you using? Pioneer by chance? Pioneer are netorious for bad RCA grounding and you will need to either ground the chasis of the deck, or the RCA's or both. I've had RCA noise due to bad internal ground on two Pioneer decks in a row.
also i'd resand your ground location for a little piece of mind.

ways to check if its the deck, pull the RCA from the HU or amp and if the noise is still there then its the amp causing the noise somehow, if its gone you know the noise was generated from ahead of the amp, which means HU.
If its the HU then i'd reground the HU to another position with a clean spot, if not that then ground the chasis and finally then the rca's.
if its the amp side of things make sure to isolate the amp from the chasis as said above, reground the amp (new wire, new spot, sanded) check for cuts in the RCA's from the HU to the amp where they may be grounding out. look for cuts in the speaker wire from the amp to the speakers where you hear the noise.

LOTS of info and lots to check out. I hope this helps out a little. I know it helped me solve my ground noise.

Gluck

familycar · 07-31-2007, 04:31 PM

im running off the factory deck right now, i figure im gonna get a rockford fosgate 360 later on to solve the EQ problems.

bikinpunk · 07-31-2007, 08:48 PM

Quote:

Originally Posted by awashko

Is it an A/C issue or alternator?

x2. I've never heard of A/C whine... I belive you're talking about alternator whine. It's easy to tell. it gets more high-pitched and constant when accelerating (or just raising the RPMs).

Check the resistance at the ground. Chances are it's just too high and you're causing a ground-loop issue. Find someone with a good DMM, and do a resitance check by putting one lead on the grounding location, and the other lead to the battery's negative terminal (you'll have to use some wire to make it reach).

That ground better be bare metal!

awashko · 08-01-2007, 01:17 AM

I have heard my alternator whine increase when my fogs are on... I always thought a faulty ground would burn up the amp, or cause it to power up and down... 'shorting out' if you will; any update on progress though?

07-31-2007, 03:04 AM	#1 (permalink)
familycar Member Join Date: Mar 2007 Posts: 67 iTrader: 0 / 0%	air conditioning whine after 2 channel amp install my ac whines when ever the foot is on the gas on accelerate or on the brake. i had a sub put in before powered by a 2 channel 400 watt amp, but there where no issues before. now i got another 2 channel amp put in to power the front 2 speakers and now ive got this whine in my AC, anyone know about this, the installer thought it was a grounding issue but he did some tricks with the ground to no avail.

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07-31-2007, 09:53 AM	#2 (permalink)
suorum Senior Member Join Date: Jun 2007 Location: Knoxville, TN Age: 29 Posts: 434 iTrader: 4 / 100%	The installer was right.........that's a grounding issue. Now, solutions...there are tons... 1-You can start checking the ground connections 2-Isolate the AMP from the chassis (i.e. rubber stoppers between the amp and the backseat) 3-Purchase some ground connectors.... cardomain offers them...good prices and brands (I use the Stinger ones) You did not probably hear it before because the sub works at low freq. Anyway you should have that "whine" even without the AC. Just pay attention to that....NO VOLUME but HU ON! Hope you solve this man.........it is a CPA!!!

07-31-2007, 10:57 AM	#3 (permalink)
awashko Senior Member Join Date: Mar 2007 Location: Southgate, MI Age: 22 Posts: 580 Adam iTrader: 0 / 0%	Is it an A/C issue or alternator?

07-31-2007, 12:06 PM	#4 (permalink)
janaka Senior Member Join Date: Jul 2006 Location: Cambridge Posts: 559 iTrader: 1 / 100%	what kind of HU are you using? Pioneer by chance? Pioneer are netorious for bad RCA grounding and you will need to either ground the chasis of the deck, or the RCA's or both. I've had RCA noise due to bad internal ground on two Pioneer decks in a row. also i'd resand your ground location for a little piece of mind. ways to check if its the deck, pull the RCA from the HU or amp and if the noise is still there then its the amp causing the noise somehow, if its gone you know the noise was generated from ahead of the amp, which means HU. If its the HU then i'd reground the HU to another position with a clean spot, if not that then ground the chasis and finally then the rca's. if its the amp side of things make sure to isolate the amp from the chasis as said above, reground the amp (new wire, new spot, sanded) check for cuts in the RCA's from the HU to the amp where they may be grounding out. look for cuts in the speaker wire from the amp to the speakers where you hear the noise. LOTS of info and lots to check out. I hope this helps out a little. I know it helped me solve my ground noise. Gluck

07-31-2007, 04:31 PM	#5 (permalink)
familycar Member Join Date: Mar 2007 Posts: 67 iTrader: 0 / 0%	im running off the factory deck right now, i figure im gonna get a rockford fosgate 360 later on to solve the EQ problems.

08-01-2007, 01:17 AM	#7 (permalink)
awashko Senior Member Join Date: Mar 2007 Location: Southgate, MI Age: 22 Posts: 580 Adam iTrader: 0 / 0%	I have heard my alternator whine increase when my fogs are on... I always thought a faulty ground would burn up the amp, or cause it to power up and down... 'shorting out' if you will; any update on progress though?