Alternator Whirr

[ryaniskingofyou]

Alrighty, so I've had a sub in my car for a while now, and I keep having the same problem. Whenever I turn on my car, I get alot of alternator whirr through the sub. Any ideas on whats causing it?

[NAiL05]

Its going out on you.

[ryaniskingofyou]

the subs going out, the amps going out, what?

[NAiL05]

Alternators slowly wearing out.

[ryaniskingofyou]

dayum. around how much would that be to fix that?

[accordztech]

hahahahahahhahaha!!!!!!!!!!!!!!!

does it make the noise when the deck is on or off...do you have an aftermarket deck or factory...

first check your stuff, good rca's....good grounds etc.

most of the time at work we diagnose it as a bad deck, put another deck in and its all gravy.

the way i do it is this:

confirm that the grounds on the amp are good

run a known good rca from the deck to the sub real quick to see if it does it

does it still do it when the rca is disconnected?

chassis ground the deck

put another known good deck with no noise. perferably same brand so that you dont have to swap harnesses.

if the new deck is still doing it, with the new and the old rca's then it may just be the amp.

this guy came in and his sub was bobbin back and forth and if he did anything the subs will make a weird sound...it was his deck.

[Bird333]

Are you running the RCA/spearker wires along side your power wire(s)? If so, run them on the other side of the car. Also you might want to try twist the rca/speaker wires together as you run them to your amp.

[bruno8747]

Ground loop problem, Its your RCA and maybe the power to the deck, Get high quality RCA's and see if the problem persists.

[oranger]

what accordztech said. ground problem. alternator might, but probably isnt going out...

[ryaniskingofyou]

aftermarket deck, I had the same problem with my old CD player, and it eventually blew the outputs and made it so i could only hear the subwoofer. After I switched to a new deck, it didnt happen for a while, and now the bastard's back. I put a new ground on it a few months back, and I thought that fixed it, but sure enough after about a week it was humming again
oh, and it doesnt do it when the deck is off, just when its on. and if i remember right, it doesnt really do it when the car has just the battery on, just when the car is actually started.

[Heavyhitter92]

i didnt read all of the post so if this is said already my bad
1. check your ground...the best place to ground ur amp is to the seatbelt bolt
2. u may need a new set of rca's
3. ur radio isnt properly grounded
if ur sub was on its way out it would sound like paper ripping (kinda) or u would get a popping sound when the bass hits
i believe ur hearing "engine noise" if thats the correct term

[accordztech]

get a pair of rca's and sling them over to teh amp, no need to run them...is the sound still there??

if you fiddle the rcas at the amp does the sound come and go?

can also be a bad amp.

are you going through rca's or ghetto speaker level?

[ryaniskingofyou]

rca's. sounds like thats what i need to do. thanks guys