Re: No Joy with Diagnosis of Negative Amps & Declining Volts
by Garrett Wysocki » 5 years ago
After looking at the schematic for the Vans RV12 you may have a blown fuse or circuit breaker labeled generator it is 30A and if it is open the battery will discharge as you describe. It is in the AV 6000-Power module section of the schematic. Hope this helps.
Re: No Joy with Diagnosis of Negative Amps & Declining Volts
by Lionel Sobel » 5 years ago
Garrett Wysocki wrote:After looking at the schematic for the Vans RV12 you may have a blown fuse or circuit breaker labeled generator it is 30A and if it is open the battery will discharge as you describe. It is in the AV 6000-Power module section of the schematic. Hope this helps.
It does help, because it gives me hope. I’ll check the fuse tomorrow. Thanks.
Re: No Joy with Diagnosis of Negative Amps & Declining Volts
by Lionel Sobel » 5 years ago
Garrett Wysocki wrote:After looking at the schematic for the Vans RV12 you may have a blown fuse or circuit breaker labeled generator it is 30A and if it is open the battery will discharge as you describe. It is in the AV 6000-Power module section of the schematic. Hope this helps.
I just got back from the airport. The 30A generator fuse is good. It passed the visual inspection test, and multimeter tests for Continuity and Resistance.
But, my problem may indeed have been caused by a blown fuse, just as you suggested. The suspected fuse (suggested by another RV-12 owner) is hidden and soldered inside the Van's "Power & Switch Module." I can't imagine why Van's would have put a fuse there, but I'm advised that it has, so that's what I'll check next. Naturally, the Power & Switch Module has to come out of the plane, and then be opened, in order to test the fuse. But hey, it'll be a learning experience. Thanks a lot for your help.
Re: No Joy with Diagnosis of Negative Amps & Declining Volts
by Lionel Sobel » 5 years ago
Joy at last!
My problem was a blown fuse hidden inside a Van's switch module. I replaced the module, and now the Rotax generator and Ducati rectifier/regulator charge my battery again.
The problem appears (to me) to be unique to Van's RV-12s equipped with second generation switch modules. First generation modules didn't have fuses in them, and (I was told by Van's builder support) that some kit builders ruined circuit boards when they did things with the Master switch on. The fuse in the second generation module was designed to prevent that. Alas, replacing the second generation module was neither cheap nor easy. But it did the job, so I have a flying plane again.
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