sonick

So I recently replaced my Pioneer GM-4000f 4ch amp with an MTX TC4004.

With my JVC KD-R800 head unit, I am now getting alternator noise/whine from the new amp from the front MTX component speakers which the amp is powering. I previously did not have ANY noise at all.

RCA's are "E2" brand "twisted pair" from Canadian Tire. Power and ground wires for amp are 4ga.

The whine does not increase with volume. At "1", the noise is just as loud as if it were at "30" and also persists when it is on PAUSE. However, it goes away at "0" as I think the HU cuts output altogether at "0". It gets louder with the headlights on.

I have gone through the following, which resulted in noise:

• New dedicated ground point for HU (at the driver steering column)
• New shorter ground point for amp (10", to sheet metal under the rear deck)
• Shared ground point for HU and AMP under the rear deck
• Disconnected RCA's at HU
• Set of cheapie home RCA's directly from HU to AMP through the middle of the cabin
• Stinger Ground Loop Isolator at AMP or HU end of the RCA (it may be faulty as I noticed the labeling was backwards with the female RCA ends going "to amp" and male RCA's going "to source")
• New positive battery terminal, new negative battery ground cable.

I have gone through the following with NO noise:

• iPod directly to amp with 1/8" headphone to RCA cable
• Shorted RCA's at AMP (amp is not the culprit)
• Disconnected RCA's at AMP
• Re-installed Pioneer Amp to ensure I didn't blow the HU (HU is not the culprit)
• iPod directly to amp via the RCA at the HU side (RCA is not the culprit)
• Shorted RCA's at HU (AMP is not the culprit)

This is killing me! Thanks for reading.