I've been chasing down an annoying whine on my (new to me) 07 Escalade for about a month now. The whine is 100% alternator related, as if I disconnect the + cable from the back of the alternator, the whine goes away. The alternator also seems to be under stress as I noticed a fair amount of belt rubber on the alternator after only a 100 miles of driving.
I've tried:
* 3x new alternators (AcDelco, WAI)
* A new belt
* A new battery (also bench tested the old battery)
* NO battery (disconnected the battery while the car was running)
* Cleaning the battery terminals & connectors with sand paper
* Cleaning the fusible link and connectors with sand paper
* Cleaning the negative cable that runs from the battery to the engine block passenger side
* Cleaning the negative cable that runs from the back of the engine block to the firewall drivers side.
While narrowing it down to the alternator, I also replaced these so they can be 100% ruled out as culprits:
* Idler pulley
* Tensioners (main and AC)
* Water pump
* Power steering pump
The car has no aftermarket audio or other power consuming devices. The alternators have all been 145A rated.
The car starts, runs and drives 100% fine.
I've tried:
* 3x new alternators (AcDelco, WAI)
* A new belt
* A new battery (also bench tested the old battery)
* NO battery (disconnected the battery while the car was running)
* Cleaning the battery terminals & connectors with sand paper
* Cleaning the fusible link and connectors with sand paper
* Cleaning the negative cable that runs from the battery to the engine block passenger side
* Cleaning the negative cable that runs from the back of the engine block to the firewall drivers side.
While narrowing it down to the alternator, I also replaced these so they can be 100% ruled out as culprits:
* Idler pulley
* Tensioners (main and AC)
* Water pump
* Power steering pump
The car has no aftermarket audio or other power consuming devices. The alternators have all been 145A rated.
The car starts, runs and drives 100% fine.
