Re: Battery Voltage (long)
***** got to bloody retype this as the damm firewall logged me out and lost the bloody post!!***
Okay only just checked my hotmail as I have been fcuk off busy!
First off at the 4ch amp switch the RCA's from front to back.
if the noise moves the problem is at the input side of the amp - swap the RCA's back again.
at the HU swap the RCA's front to back.
if the noise moves the RCA is the problem - replace it, if the noise stays at the rear the problem is with the output stage of the HU - get it checked.
If the noise stays at the rears when you swap the RCA's at the AMP then the problem is with the output side of the AMP
Swap the RCA's back again.
now swap the speaker connections on the output side of the amp.
if the noise moves to the front speakers the problem is with the output stage of the amp, get another 4ch amp to test with.
if the noise stays with the rears then check/replace all the cabling between the amp and the speakers - if this all appears to be okay borrow another pair of speakers to test with, your speaker/s could have failed.
what you may well find that disconnecting/reconnecting cures the problem - I had someting very similar with the skyline that I couldn't trace, but by the time I put it all back to how I started the problem was gone.
the only other thing to consider is earthing both amps to the same place. I am not sure how much of this I belive but there are some that theorise that multiple earthing locations can cause alt noise.
hope that helps - it took a lot less typing the second time!!