Whining noise from speakers with rpm

[Joseph Garcia]

Perhaps it is the interface unit, which you had not previously mentioned. Is it properly grounded as well?

 

[Davidfranklin1997]

To run a after market radio I had to buy the radio interface kit so it would work I don’t have the pac one I have the stinger one it is a cheaper one

 

[S33k3r]

To be clear, you are only getting the interference when the truck is running, correct? If that is the case, you likely have a dirty power wire, that is allowing the field generated by the alternator to intrude on your sound system. I don't know enough about sound systems in general, or yours specifically, so I'll stick to what I am familiar with: The alternator may be starting to fail. You get these sorts of transient issues when they start to fail, and you could start seeing a reduction in MPG. Alternately (no pun intended), your alternator may not be powerful enough to run everything.

Good luck!

 

[Fless]

Cheap test: wrap the interface box with aluminum foil to see if that improves it. Don't wear a tinfoil hat when you do....

 

[Davidfranklin1997]

To be clear, you are only getting the interference when the truck is running, correct? If that is the case, you likely have a dirty power wire, that is allowing the field generated by the alternator to intrude on your sound system. I don't know enough about sound systems in general, or yours specifically, so I'll stick to what I am familiar with: The alternator may be starting to fail. You get these sorts of transient issues when they start to fail, and you could start seeing a reduction in MPG. Alternately (no pun intended), your alternator may not be powerful enough to run everything.

Good luck!

I replaced my alternator probably 2 months ago. I only have a Rockford fosgate 400x4 amp running my door speakers I don’t have my subs hooked up untill I can figure out what is going on. I will try replacing the power wire next. Thank you

 

[S33k3r]

What brand of replacement did you use for your alternator?

 

[Doubeleive]

are the rca's shielded? or just whatever was the cheapest?
I would ohm test your ground at the amp also, you should have basically 0 ohm's on the ground and the power wire should have pretty much whatever voltage is coming out of the alternator with very little to no drop.

 

[91RS]

You have a ground loop. Try grounding the radio and amplifier to the same ground. If not, get a ground loop isolater.

 

[Davidfranklin1997]

I believe the ac Delco alternator. I have Rockford fosgate shielded and braided rca’s the ground for my amp is grounded to the frame

 

[S33k3r]

Is it the pro line or the standard Delco line? My understanding is that there are multiple lines now, and that the top of the line stuff is what you want.