HI All, Happy Holidays, Noise question.

[jfmusic]

I have a 40-year-old car. For the last six months, since I installed a new stereo and amplifiers, the car was quiet. All was good.
added LED bulbs through the car.
Still all quiet.

I found I was having a voltage drop under the dash and went through my harness, looking for bad connections. Found a few.
Including the ground wire at the battery connector terminal was loose.

I drove and found major noise and Alternator whine rpm affected. (voltage back up to 13.8-14.2)

More complex:
Major noise with key on and engine not running.

I put a separate power and ground to the head and amps. And it was quiet.
I turn the key on and it scrams noise. Car not running just in on position.

I started disconnecting everything from the coil back looking for an ignition point being the problem. Made no difference.

I installed New 12Ft RCA triple shielded from Head to Amps. No Fix.

Moved the RC Amp Feed to the other side of the Car. No Fix.

I found your threads on noise here and added the ground around the Rca's and attached to a solid OEM ground point by the radio.
Didn’t fix.

I tried adding PAC noise filters NSI-1's Didn’t Fix
Added snap around the wire chokes on the Posi wire Didn’t fix.

Suggestions, please.

Thank you in. advance

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[1aespinoza 10+ year member]

Suggestions, please.

Is it a Pioneer radio?

 

[jfmusic]

Is it a Pioneer radio?

Sony

 

[1aespinoza 10+ year member]

Sony

To clarify, when the key is in accessory there is no noise. When you key it to the run position, noise begins. Is this so?

 

[jfmusic]

To clarify, when the key is in accessory there is no noise. When you key it to the run position, noise begins. Is this so?

Nope, In accessories and Run. Such fun.

 

[1aespinoza 10+ year member]

Nope, In accessories and Run. Such fun.

Try connecting your phone direct to the amp via 3.5mm to RCA cable. If noise is still present, the amp is the issue. If no noise, then move to the radio. Connect a speaker direct to the radio and test it.

 

[Jimi77 5,000+ posts]

Temporarily bypass the accessory key position by tying the 12v constant and switched 12v. If that eliminates the noise, then it's something that comes on when in accessory position. Fuel pumps are common culprit.