Cessna 172 Alternator Problem

[kevinfolsom]

I fly the Cessna 172 with the standard (I suppose ancient) instruments-not the G1000 panel. I have noticed when I push the red battery and both white radio switches to the up position everything turns on. However, when I push the red alternator button to the up position it turns off the alternator. If I push that same red button to the down position the alternator turns on and charges. Is this correct or is it a bug or is it that I don't know what I'm talking about?

[mrzippy]

Wonder if it has anything to do with this: http://www.sim-outhouse.com/sohforums/showthread.php/123025-Reversed-Ammeter-in-Steam-C172

[Cavulife]

I'm not exactly sure of the issue you're having. I just tried a cold dark start for the non-glass 172.

 

Here is what happened:

Battery switch ON

Avionics Bus 1 & 2 ON

AMP shows 30

Then ALT on

AMP shows 30

 

You're getting a different outcome?

[kevinfolsom]

Wonder if it has anything to do with this: http://www.sim-outhouse.com/sohforums/showthread.php/123025-Reversed-Ammeter-in-Steam-C172

 

That's it exactly. Thank you so much. I will give it a try.

[kevinfolsom]

Here is what happened to me:

Battery switch ON

Avionics Bus 1 & 2 ON

AMP shows +30

Volts light on

Then ALT on

AMP shows -30

Volts light off

 

It looks backwards to me. I thought the AMP gauge needle should go up into the positive zone (0 to +60) when the alternator switch is on and charging with the Volts light turning off. Conversely, the needle should go down into the negative zone (0 to-60) when the alternator switch is off and not charging with the Volts warning light on.

[mrzippy]

Hope that minor change makes all of the difference! ;)