'95 525iT Check engine light and trans prog message

[atomicDog]

Thanks for the info. I will check the codes this evening and report back. Charging system should be OK, as I have a new battery and alternator, but I will check the voltages, too. With the car running, what are the normally expected voltage ranges for this vehicle?

[whiskychaser]

Thanks for the info. I will check the codes this evening and report back. Charging system should be OK, as I have a new battery and alternator, but I will check the voltages, too. With the car running, what are the normally expected voltage ranges for this vehicle?

With a meter across the battery you should get about 12.6V if the battery is fully charged (key off). With the engine running this should go up to about 13.8V. Turning on the headlights/heated screen etc shouldnt affect it.

[atomicDog]

Thanks again. I'll check it tonight to understand what my voltage range is. I thought I saw a voltage of 17.3 volts with the car running the other day, but I need to verify that. I replaced the alternator with a new one less than 2 months ago. Am I correct to assume that the voltage regulator is internal to the alternator?