Alternator whine and other problems

[Jeoy Gunz`]

My system recently decided to put out this annoying as hell alternator whine. I just replaced the alternator a couple of months ago. I went over my grounds and all my connections. Yet still this noise comes and goes. It doesnt always stay on. I found that if i have my radio loud for awhile the noise takes longer for it to go away. However the past week the speakers are cracking every so often and the whine does not go away. Also when i hit the brake my lights dim and if im standing still in drive sometimes the lights come on the dash and the radio cutts off. Once i give it a couple of revs it goes back on. Iv checked the voltage when i put the new alternator in and everything was fine i havent changed a thing. I have a active crossover hooked up to an amp that runs my speakers and 2 subs. I also have a capacitor hooked up to so i would think my lights shouldnt dim I would think it would be the grounds but i already checked them twice. Is there a method that you can check if you have a good ground. Im at a total stump right now. If anybody can help it would be greatly appreciated.

[MrSo0h0o]

did you make sure you scraped away any paint from the ground points? which ground points did you check? what ground point are you using for your head unit. Is your power wire run next to your RCA's?

[Jeoy Gunz`]

I did scrap all the paint away from the points. The rca cables are on the other side of the car from the power cables. I actually never checked the ground from the radio. Im going to do that right now.

[DjiNN]

If you have a Pioneer headunit then you need to reground your headunit like this

[MrSo0h0o]

Originally Posted by DjiNN

If you have a Pioneer headunit then you need to reground your headunit like this

I actually think I may need to reground my kenwood excelon unit like that also. I have been having some alt. whine issues lately

[dr_green]

Originally Posted by Jeoy Gunz`

My system recently decided to put out this annoying as hell alternator whine. I just replaced the alternator a couple of months ago. I went over my grounds and all my connections. Yet still this noise comes and goes. It doesnt always stay on. I found that if i have my radio loud for awhile the noise takes longer for it to go away. However the past week the speakers are cracking every so often and the whine does not go away. Also when i hit the brake my lights dim and if im standing still in drive sometimes the lights come on the dash and the radio cutts off. Once i give it a couple of revs it goes back on. Iv checked the voltage when i put the new alternator in and everything was fine i havent changed a thing. I have a active crossover hooked up to an amp that runs my speakers and 2 subs. I also have a capacitor hooked up to so i would think my lights shouldnt dim I would think it would be the grounds but i already checked them twice. Is there a method that you can check if you have a good ground. Im at a total stump right now. If anybody can help it would be greatly appreciated.

My local dealer says this can also happen when you disconnect power from your deck, meaning the battery cable, and then reconnecting the power to your deck, meaning the battery cable back on the battery. With the battery cable being removed and reconnected, the deck power cable remains. When this happens, sometimes when reconnecting the battery, there is a small surge of power going in your ACC shorting your little capacitors in your deck, which is the noise suppressing devices(which capacitors in the signal world is a filter).

So, acutally your local shop might be able to repair the capacitors for you. That's another thought if your grounding scheme doesn't work. Good Luck!