Engine Noise with dual RCA's

[Trls250s]

never heard of those RCA's

They are just good quality audio connects I have used on home theater equipment with (as per blurb)
Twisted-pair construction with directional noise drain provides more accurate sound reproduction
Oxygen-free copper conductor lowers resistance for crystal-clear results
Overlapped Mylar® shielding minimizes noise and interference

What battery do you have and what is the CCA rating of it/age of it..

CCA 380

1. Seperated the earth points
2. Checked and cleaned battery and alternator connections
No luck

I tryed with the RCA's unplugged at the amp first then head unit & no noise with either.

[Trls250s]

Did find in my searches this flow chart which I thought was good.

http://www.poweracoustik.com/pa2006/tech_tip_nois.htm