cMaikai

Car is 2004 3.9 Mustang w/ Mach 460 system.
I had an aftermarket radio put in in 2007. All other stuff is stock/Mach 460.
My knowledge of car electronics is limited to none so bear with me.

Recently, I started to hear an buzz coming from my rear speakers that changes pitch with the engine revs. I went behind the radio to see if I could figure it out. I could wiggle one of the RCA cables and the buzz would stop, but it would eventually come back. No idea.

I've read there could be a loose ground? I've checked my voltage with a meter and voltage is fine. 12v off, 14.4v idle.

I had an audio guy tell me it's the amplifier, but I don't want to spend money replacing it without being sure.

Just trying to figure out what's up and what needs to be replaced.

Thanks!

Blueper

Go and get your battery checked.

cMaikai

I just replaced my battery because it was spilling acid.

AudioNutz

Re-ground everything, and ground it to the same point on the vehicle's chassis.

cMaikai

Where can I find all of the grounds?