If I have a dtc of P0622 does that mean that I have bad wiring going to my alternator and need to switch out the wiring harness. I recently replaced my alternator with a PA performance alternator. Do I need to switch out the wiring harness and how do I switch it out?
Year : 2006
Make : Ford
Model: Mustang GT
Engine: 4.6L V8
Access the alternator, test the Red voltage supply wire, this should have battery voltage at all times.Unplug the 3 pin connector, check pin 3, Orange and Light Blue wire, this should have battery voltage at all times from fuse 43 in the under hood fuse box.Ensure battery cables are secured on power and ground side and there is no corrosion.Leave the alternator unplugged, access the PCM located in the right front of the engine compartment, unplug the PCM connector.Voltage drop test the following circuits between the PCM and the alternator, ensure also the following circuits are not shorted to each other.Yellow and Light Blue wire, pin 13 at PCM, pin 2 at the alternator.Yellow wire, Pin 5 at PCM, pin 1 at the alternator.If all the circuits to the alternator pass, and the circuits between the PCM and the alternator are good, suspect alternator. If the concern is still present, suspect failed PCM.Hang on I will get picsTim West40367.9050065162
Would corrosion on the battery terminal make dtc P0622 appear?
Yes, well kinda, Add an auxiliary ground from the alternator body to the battery and from the body to the battery to see if any change. Add auxiliary ground and leave it in place.
If you do a voltage test on the alternatpr what should the DCV voltage read?
do you mean what should the output of the alternator?