Alternator outputs while coasting

[Techun]

Has anyone noticed the alternator primarily operates while coasting?

Has anyone verified the same with a manual?

That means we could get even worse mpg with a traditional system!

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[VelocityBronco]

The alternator is operating any time the engine is running.
I guess I'm confused by your statement...

 

[Techun]

The alternator is operating any time the engine is running.
I guess I'm confused by your statement...

If you have voltage up on your screen while driving, generally while idling or applying throttle it sits at 12.8-13.5v.

When rolling with no throttle applied it jumps to 14v+.

So yeah the belt is always spinning but the alternator isn't always "operating".

 

[Happytown]

That behavior sounds like the alrernator is being electrically "unloaded" when you take your foot off the gas. There may be some electrical loads that turn off or otherwise decrease while coasting.

 

[Techun]

That behavior sounds like the alrernator is being electrically "unloaded" when you take your foot off the gas. There may be some electrical loads that turn off or otherwise decrease while coasting.

I suspect it's the opposite. The alternator is primarily operating when coasting. Saves gas and reserves power for acceleration.

Of course if you were at part throttle on the highway forever it would eventually have to kick on.

 

[VelocityBronco]

Mine is at 13.5V while idling right now, and was 14-14.5V on my drive to work. I never saw it drop below 14V while driving. All normal for me.

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