zerotact Posted October 7, 2015 Report Share Posted October 7, 2015 Something Similar to this? Maybe a little more prominent. IMG_1149.MOV Quote Link to comment Share on other sites More sharing options...
tony Posted October 8, 2015 Report Share Posted October 8, 2015 Looks like your running a little hot. That oil temperature and pressure doesn't make you a little nervous? Quote Link to comment Share on other sites More sharing options...
mooniac15u Posted October 8, 2015 Report Share Posted October 8, 2015 Something Similar to this? Maybe a little more prominent. IMG_1149.MOV That looks like it might be at least partially a grounding issue. With the M20J a bad ground will cause the two temperature gauges to read high and the rest (oil press, fuel press, fuel quantity) to read low. Since it seems to be affecting multiple gauges it could be the main airframe ground. Quote Link to comment Share on other sites More sharing options...
buddy Posted October 13, 2015 Report Share Posted October 13, 2015 I had the same problem on my 201, on the back of the key switch mooney uses spade connecters, you have to go under the panel with a screwdriver and push all the spade connecters back on tight on the back of the switch. This will not be a permanent fix you will have to do this every time you see your ammeter start jumping around and I had my 201 for about 30 yrs. so you can plan on doing this once a year. This was not one of mooneys better ideas. Quote Link to comment Share on other sites More sharing options...
mike_elliott Posted October 13, 2015 Report Share Posted October 13, 2015 Peter, did you ever get this fixed? If so, what was the fix? Quote Link to comment Share on other sites More sharing options...
MARZ Posted October 13, 2015 Report Share Posted October 13, 2015 I am also having the same problem of the amps fluctuating. I checked the terminals on the Master switch and they are clean, absolutely no corrosion. The volts stay steady, which makes me think it is not the voltage regulator. The amp fluctuation goes away if I take the alternator off line. Popping every CB with the alternator on does not result in the fluctuations disappearing. Interestingly though, when I pop the announciator panel CB, it automatically takes the alternator off-line, and I have to reset the alternator CB in order to get it back on. The alternator and the battery are about 1 year old. What do you guys think...it seems that there is an alternator connection to all this - diodes? I have the PlanePower Alternator installed. Also, why does popping the Announciator panel CB result in the alternator going off-line? Thanks Stefan With the Alt off the dips are evenly spaced - like maybe a strobe power supply? Quote Link to comment Share on other sites More sharing options...
romair Posted October 13, 2015 Report Share Posted October 13, 2015 Strobes were off... Also, with the alternator off there is a significant difference in the fluctuation (almost none) then with the alternator on. i recently checked the alternator with a car tester and while I was expecting it to say that there is a problem with the charging system, it actually gave it an "an okay" stumped by it... Quote Link to comment Share on other sites More sharing options...
PTK Posted October 13, 2015 Author Report Share Posted October 13, 2015 Peter, did you ever get this fixed? If so, what was the fix? No Mike, I haven't had the opportunity to tackle it. I can say with certainty that the fluctuation is RPM dependent. Quote Link to comment Share on other sites More sharing options...
MARZ Posted October 14, 2015 Report Share Posted October 14, 2015 Hmm - it really seems to me that the Amps are reacting to some type of draw, your volts are remaining pretty level. Have you pulled all the breakers and monitor the amps? if it levels out, engage one at a time and watch the fluctuations. Quote Link to comment Share on other sites More sharing options...
PTK Posted January 8, 2016 Author Report Share Posted January 8, 2016 I'm happy to report the ammeter fluctuation is no more! Condition cured! Battery is good and so is alternator and master connections. What I did was remove the left most panel piece that the ammeter is on along with clock and ignition switch. My goal was to check the connections to the ammeter, clean them and tighten them. There are two boots that cover and protect the connections behind the ammeter. One had slid off exposing the connector so I secured it. The other was in place. That seems to have solved the fluctuation. 4 Quote Link to comment Share on other sites More sharing options...
mike_elliott Posted January 19, 2016 Report Share Posted January 19, 2016 On 1/8/2016 at 7:17 PM, PTK said: I'm happy to report the ammeter fluctuation is no more! Condition cured! Battery is good and so is alternator and master connections. What I did was remove the left most panel piece that the ammeter is on along with clock and ignition switch. My goal was to check the connections to the ammeter, clean them and tighten them. There are two boots that cover and protect the connections behind the ammeter. One had slid off exposing the connector so I secured it. The other was in place. That seems to have solved the fluctuation. Was it just that one of the boots slid off, or did you clean and tighten the connector and did you clean the master switch terminals? I am Glad the issue was resolved, Peter. I wonder how in the world a dust boot could slide off in the first place, but I bet so do you. Quote Link to comment Share on other sites More sharing options...
Cardinal767 Posted February 5, 2016 Report Share Posted February 5, 2016 Glad I'm not the only one who had this issue. I kept it simple and followed the advise listed above. EDM 800 showed the voltage jumping up and down 13.5 to 13.8. For me it was the ground wire on the back of the alternator. Fixed with a couple of turns of the screw. Thanks for the help gentlemen. Bob G. 1 Quote Link to comment Share on other sites More sharing options...
carusoam Posted February 6, 2016 Report Share Posted February 6, 2016 The power of MS... Best regards, -a- Quote Link to comment Share on other sites More sharing options...
jerrybeach Posted June 16, 2021 Report Share Posted June 16, 2021 Amps fluctuating regularly every two seconds from small charge to large discharge. Volts stay between 12.3 and 13.5 under heavy load. Have a new battery and voltage regulator. I can hear it in my head sets. It acts like a very high amp strobe cycling, but l have shut the strobe off. Thanks, Jerry Quote Link to comment Share on other sites More sharing options...
carusoam Posted June 16, 2021 Report Share Posted June 16, 2021 Welcome aboard Jerry! Got a question to go with that, or just your observation? Best regards, -a- Quote Link to comment Share on other sites More sharing options...
PT20J Posted June 20, 2021 Report Share Posted June 20, 2021 On 6/15/2021 at 7:38 PM, jerrybeach said: Amps fluctuating regularly every two seconds from small charge to large discharge. Volts stay between 12.3 and 13.5 under heavy load. Have a new battery and voltage regulator. I can hear it in my head sets. It acts like a very high amp strobe cycling, but l have shut the strobe off. Thanks, Jerry Try pulling the circuit breakers one at a time to isolate the circuit. If this started after replacing the voltage regulator, check that. Quote Link to comment Share on other sites More sharing options...
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