Hello,

Here are the symptoms of my problem. If i turn the ignition to ACC the unit starts as normal but i get alot of excess noise out of the tweeters. If i unplug the RCA connectors at the back of the hu, the noise disappears. If i was to turn the engine on, i get a loud alternator whine through all speakers and i can hear about every electric motor in the car over the speakers.

Here is what i have done to remedy the problem. First off I have a 90 Corvette that is mostly fiberglass, so i ran a 4 gauge ground wire straight from the amps to the battery. I ran a 14 GA solid wire from the hu to the battery, I grounded the shielding of the RCA's to the same wire as well as the deck chassis. I tried putting filter caps on the battery and acc connections- Made noise worse. Tried running a 14 ga ground and power wires straight from my amps to the hu- no change. I took 4 ga jumper cables and tried clamping them from the battery ground to the frame and engine block- no change Changed amplifier out- same noise. Tried a different Deck- noise gone. If you have any suggestions to hepl me track this down it would be much appreciated. I am running a Rockford Punch 600a4, Punch 1000a2, Rockford 10 Farad Hybrid cap, 2 10" Cerwin Vega V-MAX Subs, Pioneer TS-C720PRS's and TS-C520PRS's, Stock alternator, and an Optima Red Top.

Thanks

i have had a few customers come in with the same problem with Pioneer models and the noise was gone when the headunit was switched with a different Pioneer radio, the problems where all fixed with a trip (sometimes two) to pioneers service center, a guy that i talked to @ pioneer said that there are two main causes for this.

First, the RCA connector's ground becomes "loose" inside the radio on the circuit board and this causes the noise, a simple bandaid for fixing this until you can send it out is to take a piece of wire (around 18 awg) and sticking into the RCA connection so that it makes contact with only the outside part of the connection (not the center pin) and ground the other end of the wire (therefore bypassing the "BAD GROUND" inside the radio).

The other cause is that pioneer uses little baby fuses(i think they call them "pico fuses") on all of the RCA connections to protect the units and the fuses can either compleatly blow (no sound will come out) or will partially blow (very uncommon but does happen every once and a while) and can cause noise in the system

Alright problem fixed. I ran two twelve guage wired directly from the deck to my amplifier ground and fuse block. Then i was still getting noise from the power antenna so i cut the PVC jacket off the antenna wire and cut the braiding and foil on the coax, thereby eliminating the ground loop. Finished by wrapping with electrical tape. To address the bad RCA ground, I cut all of the ground wires off the white connector behind the deck, stripped the wires and soldiered them to a 14 ga wire which i tied to the deck ground (more of a permanent fix without a trip to the svc center)

Thanks for the Help

great job, there is nothing i hate more that noise running through the system

Kingsnake, did you get this noise when the engine was both running and off?

For me I am getting a static "ticking" like noise from through all my speakers only when the ignition is turned to the second position (fuel line pressurized, but engine not running) or third position (engine running). If I just have the key turned to the first position (car is powered, but fuel is not pressurized and engine is not running) I get no noise at all.

Has anyone tried a ground loop isolator?

Kingsnake, did you get this noise when the engine was both running and off?

 

For me I am getting a static "ticking" like noise from through all my speakers only when the ignition is turned to the second position (fuel line pressurized, but engine not running) or third position (engine running). If I just have the key turned to the first position (car is powered, but fuel is not pressurized and engine is not running) I get no noise at all.

What is the year and model of car?

its possible your fuel tank is not grounded...check with an ohmmeter...

Ugh, this problem happens to me too! I installed an f90BT in my 1997 Lexus ES300 and I can hear any and all motosr that turn on in the vehicle's electrical system. Alternator, fan, CD player in HU, HU fan, etc. etc. It's SOOOOO annoying.

I was thinking about getting a ground loop isolator or choke to fix the problem, but I also thought it may have been due to problems with my factory installed amplifier to factory speakers. Additionally I was thinking about trying out the RCA outs to a 4channel amp and some 6.5"s to see if the noise is still there. The trouble is I don't have an amp and I don't want to make the investment at the moment. (Is this even a plausible solution?)

I don't have any other head units to try out in the system besides the factory one, which had none of this noise. I seriously don't know where to start. Is it definitely a bad ground? Also, the noise has gotten louder over these past few months and I don't know why....

Help or input would be greatly appreciated.

sounds like a very common problem with toyota factory amp'ed systems, did you use the wire harness with the RCA plugs? if so then a GLI (Ground Loop Isolater) would probably help out a bit, but might not fix the problem completely. you could always bypass the factory amp, with the amp inside the radio you could power up 4 speakers, if the system has more than 4 speakers then you would need an amp to power them