Charles22 Posted October 24, 2019 Report Share Posted October 24, 2019 Does anyone have a wiring diagram for a Mooney F model built in 1975... I have 1974 but can’t find it for my serial range. My battery master is turning itself on or not turning itself off and we have replaced switch, solenoid (twice), and ground wire running from solenoid to master switch and the issue is still happening. I need to know if there is something else in the system that could be “grounding” itself on. Maybe somehow in the avionics bar and it’s feeding back to the battery master switch or is there something else we are missing. I am now at 22+ hours of A&P time and we still can’t figure it out. You can imagine that...! Any help very greatly appreciated. Don Maxwell was saying ground wire to solenoid so that’s why we replaced that but no dice... Quote Link to comment Share on other sites More sharing options...
Guitarmaster Posted October 24, 2019 Report Share Posted October 24, 2019 The reason you can't find a wiring diagram for your 75 is because there is none. Your airplane is one of the transition airplanes Mooney was experimenting on with various systems before the J model came out. Your plane will have things that neither the vintage nor the J model has. For instance, your four warning lights in the glare shield. I took pictures of my wiring diagram that came with my airplane and found it to be pretty close. Hopefully this will help you. https://photos.app.goo.gl/jSufrHhoKAEqbVzZ7 Sent from my Pixel 2 XL using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
Yetti Posted October 24, 2019 Report Share Posted October 24, 2019 The early model in these schematics should suffice http://mooney.free.fr/Manuels M20J/M20J/Mooney Service Manuel M20J Vol. 2 of 2.pdf Quote Link to comment Share on other sites More sharing options...
spectre6573 Posted October 24, 2019 Report Share Posted October 24, 2019 Here it is. I got it from Mooney directly because I was in the same boat as you. Non of the wiring harness number matched and there are slight differences. Since I paid for the all the lot of manuals when I got my airplane, there was a blurb in there that not all model electrical diagrams are included and that I would need to contact Mooney to get the one specific for my airplane. cheers. sci-800269l-0.pdf 1 Quote Link to comment Share on other sites More sharing options...
Charles22 Posted October 24, 2019 Author Report Share Posted October 24, 2019 24 minutes ago, spectre6573 said: Here it is. I got it from Mooney directly because I was in the same boat as you. Non of the wiring harness number matched and there are slight differences. Since I paid for the all the lot of manuals when I got my airplane, there was a blurb in there that not all model electrical diagrams are included and that I would need to contact Mooney to get the one specific for my airplane. cheers. sci-800269l-0.pdf 524.65 kB · 2 downloads Thank you so much!!! This is a lifesaver. Quote Link to comment Share on other sites More sharing options...
Charles22 Posted October 24, 2019 Author Report Share Posted October 24, 2019 19 hours ago, Guitarmaster said: The reason you can't find a wiring diagram for your 75 is because there is none. Your airplane is one of the transition airplanes Mooney was experimenting on with various systems before the J model came out. Your plane will have things that neither the vintage nor the J model has. For instance, your four warning lights in the glare shield. I took pictures of my wiring diagram that came with my airplane and found it to be pretty close. Hopefully this will help you. https://photos.app.goo.gl/jSufrHhoKAEqbVzZ7 Sent from my Pixel 2 XL using Tapatalk Thank you, this is useful info, I also have a different flap switch than other F models. Although thanks to spectre 6573 I was able to find the wiring diagram. 1 Quote Link to comment Share on other sites More sharing options...
Marauder Posted October 25, 2019 Report Share Posted October 25, 2019 3 hours ago, Charles22 said: Thank you, this is useful info, I also have a different flap switch than other F models. Although thanks to spectre 6573 I was able to find the wiring diagram. How is your flap switch different? Quote Link to comment Share on other sites More sharing options...
David Lloyd Posted October 26, 2019 Report Share Posted October 26, 2019 My battery master is turning itself on or not turning itself off and we have replaced switch, solenoid (twice), and ground wire running from solenoid to master switch and the issue is still happening. Battery solenoid is pretty simple. It always is connected to the positive battery power and the master switch provides a ground for the coil in the solenoid. Is anything touching the switch terminal intermittently? Quote Link to comment Share on other sites More sharing options...
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