Another alternator whine thread

[knukonceptz 10+ year member]

You sure that whine is in the speaker and not just coming from the dash/fan itself?

How close is that fan to the RCA cable? unplug the RCA at the HU and turn on the fan. Turn on the system so that the amps power up. If any noise is getting radiated from the fan and picked up by the RCA it should be heard without signal from the HU, the amps will amplify anything in the signal path. If the fan is not brushless, it could be making some interferance. I know you tested earlier with RCA over the rear seat, but that was ALT noise then, maybe you got rid of one noise and had two the whole time??

 

[pilyin 10+ year member]

You sure that whine is in the speaker and not just coming from the dash/fan itself?
How close is that fan to the RCA cable? unplug the RCA at the HU and turn on the fan. Turn on the system so that the amps power up. If any noise is getting radiated from the fan and picked up by the RCA it should be heard without signal from the HU, the amps will amplify anything in the signal path. If the fan is not brushless, it could be making some interferance. I know you tested earlier with RCA over the rear seat, but that was ALT noise then, maybe you got rid of one noise and had two the whole time??

I'm sure it's in the speakers. It very easy to hear from the tweeters and you can hear it pretty good even from the rear. The RCA's actually go right next to the fan. I'll give your suggestion a try. I think I'm also going to check and see how the fan is wired. See where the source is. Maybe try unplugging the fan and seeing if when I turn the switch up the noise increases without the fan even plugged in.