firemangeorge

Kookie. I don't believe our cars have an internal regulator in the alternator. The service manual will even refer to what we call the alternator, as a generator.
I'm pretty sure the voltage output is controlled thru one of the computers. Just don't recall if it's the BCM or ECM maybe.

db/sb

The HHR does have an internally regulated alternator. Regardless of what GM calls it, it is an alternator with a rotor, a stator, and a rectifier bridge; items you wouldn't find in a generator.

firemangeorge

Thanks db/sb for clarifying that.

Kookie

Yeah, thats what I thought. So, a 13.2v - 15.4v output, is that usual / typical?

whopper

15.4v is high - it should peak in the mid 14.x's

Kookie

I thought so. I think there might be something wrong with that alternator. Thats why I installed the voltmeter. To keep an eye on it. But I just can't put my finger on what really might be wrong. Time will tell no doubt.

firemangeorge

Funny thing whopper. The repair manual says with the engine off, voltage should be 12.6-15.0 volts.

Just scanning thru some of the repair testing, I see references to voltages ranging from 5-26 volts.
These modern day automotive electronics sure have gotten complicated.

HHRNole

Instead of a single gauge I got a Scan Gauge II and mounted it over the airbag light. Besides being able to monitor my voltage, I can read things like MPG,intake temp,throttle position sensor,coolant temp. and the list goes on. Also if I have a code that comes up ,I can read it and clear it also.

thunder94

Nice, would look cool in the pocket under the radio IMO.