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Hi guys, For some time now I've been struggling with a problem with my electrical system. I own a 1977 M20J. It all started 8 months ago. All of the sudden after annual, my battery started to lose its charge in a matter of days. Literally after 3 days of staying in hangar, it would be so depleted that it wouldn't start anymore. After some troubleshooting we determined that the battery was old and thus it was losing its charge. I replaced it and everything worked great for some time. The longest lasted without flying was 2 months and it still had 12v precisely. A few weeks ago the problem started all over again. It started to lose power to a point where after two weeks it wasn't able to start-up, then one week, then 3 days and now it's hard to start it normally after 8hrs... It can be relevant that 2 weeks ago my alternator stopped working mid flight and was allegedly repaired by a mechanic in a foreign country. Nothing I did with the breakers or anything did anything mid flight. We checked the battery once again but it turned out to be perfectly formed and not missing any electrolyte from any of the cells. Do you guys have any idea what could be wrong? Has anyone encountered a similar problem in the past? Any suggestions? Best regards, Wojciech Kacprzyński, A fellow Mooney owner

Hi all, After several busy weeks I was finally able to fly last week and run a GAMI spread to diagnose the overheating issue of cylinder 1 on takeoff/climb. Not a massive overheating mind you (~390-400 deg) but still much higher than normal. Below are the screenshots from May this year (poor data rate but it gets the point across) and the one I took last week. You can see that the May spread was very good (about 0.2 gph). The one from last week however shows the cylinder 1 peak occurring roughly 1 gph higher than the rest of the cylinders; the other cylinders all look the same as before. To me this indicates a partial fuel blockage in either the injector itself or the feed line/distributor. I removed the injector before the flight (since I suspected this might be the issue) and everything looked clean and free. Reinstalled and flew the plane. Do y'all agree with my diagnosis? What other parts are susceptible to plugging? Since it's only this cylinder and total flow rates are normal on takeoff and cruise, I'd think it would be something downstream of (or in) the fuel distributor/spider. Should I send the injector back to GAMI to get it flow tested first before I do anything else? -Don