Quote Originally Posted by Cody Adams View Post
Anyone ever experience something like this before? Wondering if its just the scan tool tripping out or if the ecm is really commanding almost 200 volts at some random times??? Was having a charging issue when monitoring batt volt, alt volt, and ecm volt i get some random spikes and drops.
Very odd and only on the alternator voltage PID. The only way to verify if the spike is real would be to monitor and measure the voltage and current with a scope. I doubt a multimeter would be capable of measuring it but you could try with the min-max function.