I need help with radio interference

Maybe have someone cycle the key for you while you put a finger on one relay at a time?

Pull any relay that clicks with key ON. See if your receptions clears.

 

When I was into car audio, cheap patch cables (or RCA) would cause interference from poor connections.
They would also cause interference if the metal part of the plug was touching metal.

Is there open RCA jacks(or video), on the back of the head unit, touching metal?.

 

@Jimmyh @soundman98

 

No open RCA jacks touching anything

 

A)
Pull all the fuses in the interior fuse panel except what is needed for the stereo.
Does it still happen?
No - Reinstall fuses one at a time testing after each install. When it happens you have the circuit.
Yes - reinstall all the fuses removed. Continue with B) Below.

B)
Pull all the fuses in the exterior fuse panel except what is needed for the stereo.
Does it still happen?
No - Reinstall fuses one at a time testing after each install. When it happens you have the circuit.
Yes - reinstall all the fuses removed.

???

 

Almost everything in the vehicle turns on in the ON position, ECU, fuel pump, instrument cluster, power windows and more. It's the main power for most of the vehicle. The ACC position is only for the radio and power outlets, everything else that doesn't have constant power gets powered in the ON position.

 

Has the headlight switch been left in the On position (lights are coming on with the ignition)? If so, do you have LED (or HID) headlight bulbs installed? Any other exterior LED bulbs?


Edit:
N/M, you did say no LEDs in OP...

This is a strange one indeed. I guess I got nothin'

 

I didn't notice but did you pull the Kenwood's acc power and running power from the same connections the the OEM radio used. If not that may be an issue. I have a kenwood that was installed with the Tacoma wiring kit from Crutchfield that uses the original radio's power connections coming from the truck harness and it's quiet, no interference.

 

i used the same crutchfield kit direct pugin play

 

Have you taken the diagnostic steps in post 25 by @Jimmyh yet?

 

Not yet I am going to try tonight . Does any one know where the noise filter is located under the hood.

 

What noise filter?
I was under the impression that you were losing the antenna reception.

 

The reception is being disrupted by ignition noise filter malfunction causing signal interference.

 

The alternator has a filter and the other filter is just a capacitor

 

this is what i am looking for noise filter any one know where its located.