Again I griev....working out my alternator whine....
to recap...i have my sled and my sony grounded to a pigtail to the stock wiring harness grounding point.

I have the Rio HU grounded to a separate lead in the trunk where the amps are gounded

I have alternator whine

I disconnected the ground in the trunk and the whine stayed the same (read: the ground in the trunk for the HU was not effective)

to shorten this gorund run i cut the wire from the Rio

the whine went away! :-)

pushed everything back into the dash (which is a daunting task in a Miata) and all was fine ...but...throughout the week the whine slowly crept back into the system. :-(

a few notes of importance:

1-when i disconnect the sled/sony ground from the stock wiring harness the noise in umbearable (so i know tha this ground is somewhat effective)

2-When I pigtail in the ground wire from the Rio into the Stock Ground point with the other 2 grounds...no change...audible whine still present

3-On occasion...when the noise is louder than usual...i push in the left side of the Rio further into the sled and the noise quiets down..to the level that it is quieter but still annoying

Question:

Where is this "floating" noise being generated from and why did it take a few days to resurface?



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