Search the Community

Hi all, I'm having an odd electrical issue and I'm hoping someone has an M20R wiring diagram or can offer some insight on how this might be happening. I have LED nav lights installed a year ago from Aero-Lites - It's a model they don't sell any more. The left one does not turn off when the nav light switch is turned off in the plane. I started pulling breakers to see what other circuits could be causing this. It appears that the only breaker required to power them normally is the 40A Right Aux one - Is the switch also a breaker? Now the really odd part. The juice that keeps it running can come from two different sources. If the Gear Warn breaker is in, the nav light will remain on at a medium (not full) intensity. If the Starter Relay breaker is in, it will remain on at a low intensity. Putting both in does result in a slightly higher intensity than just the Gear Warn breaker being in. What could be causing this? Thanks!

Well here is my problem Last night couple friends and I jump in the airplane for an 80nm x-country to visit another buddy. So two of us get into the airplane to taxi down to the other end of the airport to pick up one more that's going on the trip (he is a cfi and teaches at my home field). When I turn the master switch on all seems normal. When I hit the fuel pump to prime the engine the pump hesitates for a second and then speeds up. When I turn it over I get a pop from the exhaust ( I think I did prime it a little too much, reason for the pop). So we taxi'd down to pick up our cfi buddy I shut it down and we get everything situated in the airplane. It took about 15 minutes before we were back in the airplane to get going I hit the master switch and the gyros start spinning again everything seems normal I hit the fuel pump and nothing. I gave it a minute and tried again and nothing. I called my mechanic and he seemed to think it was the fuel pump. After getting off the phone I try again and everything works perfect. Airplane starts just fine alternator shows a charge everything is running perfect. So we decide to go to the run up area and do a thorough run up again everything is prefect so we are on our way. Airplane ran great as always battery is pulling zero amps avionics, light all electrical is perfect. We land at French valley lock up the airplane and head to our buddy's house. Now it's the next morning we get back to the airport and I do a preflight all looks good. We load up and when I go to hit the master. Nothing. I hear the battery solenoid kick on but nothing else hit the fuel pump and nothing. Turn everything off let it sit a sec try again and nothing. So I toggled the master switch about 5-7 times and finally we get power. Gyros come alive my 496 powers up fuel pump kicks so I get it going start up, again everything is running perfect. Alternator shows a charge the whole 9. Go down to the run up area do a thorough run up and it all checks out. We get in the air and it's running great and it did the whole way home. Battery wasn't pulling any amps all is well. So we land back at Van Nuys I park and put the airplane to bed. And it was just bugging me so much I had to go look things over. I checked the battery all looked good, clean terminals water levels looked normal. All connections looked good. I looked under the panel at the wiring by the master and fuel pump all looks secure and nothing is loose. So I try to start the airplane and again nothing when I hit the master so I toggle it like I did 5-10 times and finally hear the gyros start to turn but they sound weak and slow so I toggled it agiain and they speed up and sound normal so I hit the fuel pump and it doesn't do anything it actually shuts everything down when I hit the fuel pump. 496 shuts off and gyros stop spinning. So I turn everything off and let it sit a minute and try again. Same thing, hit the master gyros sound slow and then I toggle the master and finally get them to speed up and this time I hit the fuel pump and it primes as normal but this time I go to hit the starter and when I do it, shuts everything down when. So now I can't even get it started. I called my mechanic and explained the situation and he seems to think it may be a bad master switch or even the maybe the battery solenoid or even possibly a bad battery. He was just guessing as he doesn't live close and couldn't come look at it. He told me to put a volt meter on the battery and check it so I will do that in the next couple days. But as far as exactly what the issue is I'm lost. Everything looks normal when the power finally came on line it had no problem starting the engine so I don't think it's the battery I just think it's a connection problem. So I figured I'd share this with you guys and see if you have any ideas or have experienced the same thing. Any suggestions or help would be greatly appreciated. I am going to have my mechanic fix it. I just want to see if maybe I can narrow the problem with your help. Thanks for reading and sorry it was so long. Regards and happy safe flying Mike