I have a bad squeal, however I tried a new alternator and it did not go away. The charging voltage does not go above 12.3 and when I unplug the plug on the back of the alternator the squealing stops but I lose voltage. Revving the vehicle does nothing but make the squeal louder. I have checked all connections and I have tested the batteries. I have checked the wires. What am I missing> Please help me….
That year of RAV 4 uses the alternator to tighten the belt. It may not be adjusted properly and the belt is slipping.
More than likely the problem is either your serpentine belt is worn out, or the tensioner pulley isn’t providing enough tension to keep the belt in place. Belt slippage accounts for the low amount of voltage output. Because it’s the easier of the two, I’d suggest replacing the belt first. I’m not sure on your RAV4 whether there is an indicator on your tensioner to tell you whether it is providing tension in the “good range”, but you might check for it. When you put a new belt on, there may be enough grip with it to prevent the squealing, however, this doesn’t preclude there may not be an issue still with the tensioner. Really, replacing both would be the right way to go at this point.