Foley Posted July 27, 2022 Report Share Posted July 27, 2022 Problem with oscillating engine instruments and low voltage on 2 freshly charged Batteries. Dynon skyview system. swapped out voltage regulator and no change. any ideas? may rewire plug in for voltage regulator. Quote Link to comment Share on other sites More sharing options...
mikeschumann Posted July 27, 2022 Report Share Posted July 27, 2022 I had a similar problem a number of years ago. It turned out to be defective EFIS circuit breaker. Quote Link to comment Share on other sites More sharing options...
Foley Posted July 27, 2022 Author Report Share Posted July 27, 2022 Tell me about it and how you replaced it. Are we talking about a fuse? What were specific symptoms? Where was it located. Quote Link to comment Share on other sites More sharing options...
Foley Posted July 27, 2022 Author Report Share Posted July 27, 2022 Video Quote Link to comment Share on other sites More sharing options...
Foley Posted July 27, 2022 Author Report Share Posted July 27, 2022 Other video Quote Link to comment Share on other sites More sharing options...
Barry.h Posted July 27, 2022 Report Share Posted July 27, 2022 Did you say “lithium” then “lead acid”? Do you have 2 batteries with a 1 + 2 switch? You can’t put dissimilar batteries in parallel, as they have different voltages. I believe you will have charging problems. When the engine stopped both voltages were very low. The Lithium battery will (should, better) have a battery management system and that might be getting upset having a lead battery across it. When my engine starts it also runs rough for a second or so then smooths out. I have never watched the voltage, but I have also never run with such low voltage. I would start with similar/compatible batteries. Barry. Quote Link to comment Share on other sites More sharing options...
Foley Posted July 28, 2022 Author Report Share Posted July 28, 2022 Only use one battery at a time. Trickle charged separately. Load tested 2 weeks ago. Never used in parallel. EFIS battery tested as well. Quote Link to comment Share on other sites More sharing options...
mikeschumann Posted July 28, 2022 Report Share Posted July 28, 2022 My problem was the EFIS pushbutton circuit breaker on the panel. It is soldered to the PC board behind all of the pushbutton breakers, so you need someone with the necessary soldering skills to replace it. I was having very strange symptoms with the Skyview system cycling on and off. Replaced the Skyview display, which didn't make any difference. Finally ended up putting a volt meter on the output from the circuit breaker, which showed the voltage going up and down. At the same time, the voltage going to the 12V plug on the panel was stable. Quote Link to comment Share on other sites More sharing options...
Foley Posted July 29, 2022 Author Report Share Posted July 29, 2022 Mike are we talking about the bus bar? Mounted to the panel Quote Link to comment Share on other sites More sharing options...
Barry.h Posted July 30, 2022 Report Share Posted July 30, 2022 On 7/28/2022 at 9:55 PM, Foley said: Only use one battery at a time. Trickle charged separately. Load tested 2 weeks ago. Never used in parallel. EFIS battery tested as well. Hmm. Well when the engine is off you are only showing 10.n volts… on both batteries. If the batteries are charged I think you have to trace the voltages from the battery (should be 13.n Volts) And see where it is dropping. Quote Link to comment Share on other sites More sharing options...
Foley Posted July 30, 2022 Author Report Share Posted July 30, 2022 Thank you everyone. Will rewire ground from battery directly to engine. Used jumper cables and this solves the problem. Will also ground batteries separately to the frame instead of in series. Mechanic says it back fills the battery not in use. Even though hot pole not connected. Quote Link to comment Share on other sites More sharing options...
mikeschumann Posted July 30, 2022 Report Share Posted July 30, 2022 22 hours ago, Foley said: Mike are we talking about the bus bar? Mounted to the panel I'm talking about the pushbutton breakers located in the center of the panel right above the throttle, which let you turn on and off the EFIS, Nav Lights, Fuel Pump, etc.... Quote Link to comment Share on other sites More sharing options...
Alex Ress Posted July 30, 2022 Report Share Posted July 30, 2022 The "something wierd" that happens on startup is the advanced start system that delays the ignition timing for 3-8 seconds after the starter relay is not powered anymore. This is normal and is described in the service instruction added below. https://rotax-docs.secure.force.com/DocumentsSearch/sfc/servlet.shepherd/version/download/06812000002q89iAAA?asPdf=false Quote Link to comment Share on other sites More sharing options...
Foley Posted July 30, 2022 Author Report Share Posted July 30, 2022 Found out the strobes are also causing pulses Quote Link to comment Share on other sites More sharing options...
Foley Posted August 25, 2022 Author Report Share Posted August 25, 2022 problem solved. cant believe I didnt see it. the connector sheared off perfectly where it attached to the engine so it was not noticeable. and the ground was kind of hidden. 1 Quote Link to comment Share on other sites More sharing options...
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