Guilly Posted December 2, 2020 Report Posted December 2, 2020 My '97 Ovation has a low volts annunciation that stays on for the first hour of flight. Both batteries show 27.5v on the engine monitor and the amp gauge shows 0 discharge. When I turn on all things electric, the low volt annunciation stops for a few minutes then slows starts flashing. Before I start changing parts, I'm wondering if anyone has seen this before? Quote
carusoam Posted December 2, 2020 Report Posted December 2, 2020 Typically the voltage annunciator gets lit while taxiing near idle speed... The voltage from the alternator is RPM sensitive, until the rpms come up a bit... rpms that turn the light on are usually too fast for taxi speed... so dragging the brakes would be required... Sounds like you want to have your warning light trigger adjusted... there is a procedure in the MM for that... (I believe) PP thoughts only, not a mechanic... Best regards, -a- Quote
flysamo Posted December 2, 2020 Report Posted December 2, 2020 low voltage in flight, sounds like alt. over haul time, turn on lights and watch amp output, should jump up to match load. load system down and output should go up to compensate for added load, have lost 3 alternators while in flight, learned how to shed power real quick. lucky to have 2 batteries Quote
Niko182 Posted December 2, 2020 Report Posted December 2, 2020 Voltage regulator would be the first place I'd look. I'd start there with the alternator too. 1 Quote
StevenL757 Posted December 2, 2020 Report Posted December 2, 2020 (edited) On 12/2/2020 at 2:35 PM, Guilly said: My '97 Ovation has a low volts annunciation that stays on for the first hour of flight. Both batteries show 27.5v on the engine monitor and the amp gauge shows 0 discharge. When I turn on all things electric, the low volt annunciation stops for a few minutes then slows starts flashing. Before I start changing parts, I'm wondering if anyone has seen this before? Expand Is the LVA flickering or flashing? It matters. Edit...I'll add based on your note above saying it flashes. Your alternator is fine. Although there are other variables, if the condition is as you're describing, you likely have an annunciator that's seeing an overvolt condition. The gauge should be calibrated by someone who knows what they're doing, and the normal voltage should show 28.0 to 28.4 volts when the primary ALT FIELD is switched on. This is a relatively inexpensive fix. Steve Edited December 2, 2020 by StevenL757 Content Quote
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