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Let's get the collective wisdom rolling My M20J is fresh out of the avionics shop after installing a G3X panel. Last week when I flew it, the R wing fuel gauge stopped working. Well the fuel senders are old and I am contemplating a switch anyways. The very next flight, when I tried to start the engine I turned the key the plane seemed like the battery was low. I thought it was odd but maybe I spent a little too long updating the navdata with the engine off. I started it with an external source and went flying. Everything seemed normal so I took it on a 2hr XC flight. Today, flying back home I experienced the same behavior and had to use and external source to start up. Now, both COMM radios had an interference of a quick rhythmic "popping" sound. Additionally, in cruise I could see the ammeter was showing some crazy readouts, going from -30 to -290 amps!!! After I landed the ammeter showed a reasonable +2 amps. I tried turning on and off various systems and lights to see what I could find but no clue. Nothing particular happened. I suspect something is shorting the system and draining the battery. Perhaps the fuel sender line (it may have nothing to do with the electrical problem but what the hell)? Any thoughts? Here are some pictures.

I just finished updating my 1984 Mooney 201 panel. My plane spent the majority of it's life in northern Minnesota and has 2300 hours total time. Everything I am selling worked very well when removed. Reasonable offers will be considered. Here is a list of equipment being offered for sale (Images Below): King KG258 Horizon Gyro (Image 1a and Image 1B): $300 Two Auto Pilot Servos: $300 each (or $500 for the pair) Trim Servo: $500 Oil Pressure Amp Part No. 950D0311-002: $50 Antenna: $50 Avionics Cooling Fan: $50 3 Switches: $125 each Intercom: $50

I recently purchased a 1984 M20j. I installed a JPI 930, Whelen nav/strobes, BoomBeam and the LoPresti Cowling. The 930 is awesome. I removed the stock engine gages except for the cluster gages at the top of the pilot panel. Late this year I am going to install a G3X , a G5 and a GFC--500 and replace the pilot panel. My question is that the ammeter show a current draw change almost constantly. It is normal ? Maybe it is telling me that I have a alternator issue? I am new to MooneySpace, I will be listing all of the stuff I removed on the site.Thanks!