Quote:
|
Originally Posted by Sharky
You've been very helpful, even if you're not right here.  I don't know if there's perhaps some kind of "power management device" that is failing and isn't sending enough power to certain devices. |
Yes. The voltage regulator that is usually built into the alternator. However, it may be as simple as a loose alternator belt. It is possible for the belt to slip if it is not tight enough and the electrical load is high enough. This will result in lower voltage available to run things and you know what happens next. Check your service manual for the correct `slack' (~5mm) and see what yours is. It should be checked at the middle of the longest span of the belt.
With the car shut off, measure the voltage at the battery and try to find a connection method that will stay in place. Locate the meter where you can see it from inside the car and secure so that it does nor fall over when the car is started/running. It should be at least 13v and as much as 14.4v. Next, start the car with no accessories running and check again. Slowly increase the engine speed and see if the voltage goes up to ~15-16v.
That is a sign of a healthy alternator/regulator. If not, have it evaluated by a specialist auto electric shop or just replace it. I think you have your answer.