Adi Posted March 14, 2020 Report Posted March 14, 2020 Hey folks, I bought a 1983 M20J whose clock, cabin lights, and fuel flow memory, are all INOP. I spoke to Mark at Top Gun and he said he thinks it's likely a fuse in the tailcone compartment that was either removed, or has gone bad. He said he can look at it for me, but it's also possible for me to replace it directly. I'm trying to figure out where that fuse is and what kind it is. I looked in my POH & in a service manual, and this part of the electrical system is not mentioned anywhere. Does Mooneyspace have any experience with replacing this fuse? :) Adi Quote
N201MKTurbo Posted March 14, 2020 Report Posted March 14, 2020 I would look in the tailcone by the battery. Quote
laytonl Posted March 15, 2020 Report Posted March 15, 2020 The fuse usually comes off the master relay near the battery in the avionics bay. Lee Quote
Yetti Posted March 15, 2020 Report Posted March 15, 2020 Pilot side behind the wing. Black inline fuse holder is by the left wall by the battery Quote
Adi Posted March 15, 2020 Author Report Posted March 15, 2020 Thank you! Do you folks know what kind of fuse it is? Quote
Bolter Posted March 15, 2020 Report Posted March 15, 2020 @Adi It should be a 5A standard glass fuse in a very standard looking inline holder. Easy to see and the only one like it in the area around the battery in my case. I also have an '83 M20J. Soon after purchase, the same fuse blew on me, strangely enough. It has not failed since in +800 hours in +8 years. I bought schematics to track down just his problem. Picture attached for your reference. What is your SN? This is labeled as 24-1214 thru 24-1417. If you are outside this range, I will send you spare schematic if I have it (PM me). -dan 2 Quote
Adi Posted March 15, 2020 Author Report Posted March 15, 2020 Hey Dan, Thank you very much for that! My sn is 24-1381. Where did you buy the schematics? Adi Quote
Bolter Posted March 15, 2020 Report Posted March 15, 2020 1 hour ago, Adi said: Hey Dan, Thank you very much for that! My sn is 24-1381. Where did you buy the schematics? Adi I got these from eflightmanuals.com 5212-VO was the "part number" for the J repair manuals and schematics. It includes electrical schematics for all J's, but you and I are too close together (I am 24-1412) so we are the same set of docs. Before hitting SEND, I checked their website, and they do not have the same manual anymore. Sold out? There is an all Mooneys from 68-84 maintenance manual, which is better than nothing. Others may know other sources...someone who posts images from the manuals all the time... @M20Doc ? Quote
Guest Posted March 15, 2020 Report Posted March 15, 2020 5 hours ago, Bolter said: I got these from eflightmanuals.com 5212-VO was the "part number" for the J repair manuals and schematics. It includes electrical schematics for all J's, but you and I are too close together (I am 24-1412) so we are the same set of docs. Before hitting SEND, I checked their website, and they do not have the same manual anymore. Sold out? There is an all Mooneys from 68-84 maintenance manual, which is better than nothing. Others may know other sources...someone who posts images from the manuals all the time... @M20Doc ? As an MSC I have a complete library of Mooney manuals from which I screen shot and post pages here. The wiring schematics for Mooney are generally one large drawing for the entire plane and can’t be easily read once posted. Clarence Quote
PT20J Posted March 15, 2020 Report Posted March 15, 2020 Back in the late 1980s, I got a paper manual from Mooney for my 1978 M20J. It included envelopes that had folded paper schematics. When unfolded, they were a sheet of paper maybe 2 x 3 ft. That manual is long gone. I got a current manual a couple of years ago and it was two pdf files: one for the text and one containing scans of all the schematics. The schematic scans are hard to read as the scan resolution makes it difficult or impossible to read the wire numbers. Steve Rue (Mooney Service Parts Manager) told be that the paper versions are not available from Mooney - all the have is the pdf files. Skip Quote
ArtVandelay Posted March 15, 2020 Report Posted March 15, 2020 You can take the pdf to a printer (Kinkos etc), they can print them on large paper. Quote
DonMuncy Posted March 15, 2020 Report Posted March 15, 2020 If you have the schematics on a flash drive, your local print shop can print one out large enough to read. Mine is about 3 by 4 feet. A pain to lay out on the dining room table, but a godsend for being able to trace a wire from one end to the other. 1 Quote
EricJ Posted March 15, 2020 Report Posted March 15, 2020 The M20J Service Manual Vols 1 and 2 can be downloaded from the links below. The schematics are in Vol. 2. I don't have any trouble reading the schematics on a decently-sized desktop computer screen.http://mooney.free.fr/Manuels M20J/M20J/Mooney Service Manuel M20J Vol. 1 of 2.pdf http://mooney.free.fr/Manuels M20J/M20J/Mooney Service Manuel M20J Vol. 2 of 2.pdf 2 Quote
PT20J Posted March 15, 2020 Report Posted March 15, 2020 1 hour ago, EricJ said: The M20J Service Manual Vols 1 and 2 can be downloaded from the links below. The schematics are in Vol. 2. I don't have any trouble reading the schematics on a decently-sized desktop computer screen.http://mooney.free.fr/Manuels M20J/M20J/Mooney Service Manuel M20J Vol. 1 of 2.pdf http://mooney.free.fr/Manuels M20J/M20J/Mooney Service Manuel M20J Vol. 2 of 2.pdf Thanks Eric! Not sure who scanned these, but the quality is much better than the ones I got from Mooney. Skip 1 Quote
Adi Posted March 16, 2020 Author Report Posted March 16, 2020 Thanks folks! I replaced the fuse and both the clock and the interior lights are working now. Best $4 I've ever spent 1 Quote
Yetti Posted March 16, 2020 Report Posted March 16, 2020 27 minutes ago, Adi said: Thanks folks! I replaced the fuse and both the clock and the interior lights are working now. Best $4 I've ever spent It's kind of amazing how much glass fuses have become. Quote
Adi Posted March 16, 2020 Author Report Posted March 16, 2020 Well, it's a pack of 5. Hopefully I'll be as lucky as Dan and they will last for the next 4000 hours. Quote
larryb Posted March 16, 2020 Report Posted March 16, 2020 I took out the fuse when I accidentally killed the battery one day accidentally turning on the cabin lights. There are numerous threads on this. When I decided I wanted the clock back I reinstalled the fuse and removed all of the cabin light bulbs. Quote
larrynimmo Posted March 16, 2020 Report Posted March 16, 2020 I am an electrician by trade (among other skills). When I got prints made, I had the electrical diagram laminated. Then I take a straight edge and I use color coded marksalot at the turn point of wires of interest. If you need to, you can use your bare finger to erase the otherwise permanent ink. this method makes tracking the individual wires easier and more accurate. just sharing 1 Quote
Oldguy Posted March 16, 2020 Report Posted March 16, 2020 21 hours ago, EricJ said: The M20J Service Manual Vols 1 and 2 can be downloaded from the links below. The schematics are in Vol. 2. I don't have any trouble reading the schematics on a decently-sized desktop computer screen.http://mooney.free.fr/Manuels M20J/M20J/Mooney Service Manuel M20J Vol. 1 of 2.pdf http://mooney.free.fr/Manuels M20J/M20J/Mooney Service Manuel M20J Vol. 2 of 2.pdf I get my hopes up every time I see a link for the schematics, but I have yet to find a single copy where I can read the page for mine - 24-1492. If anyone has a legible version, please let me know. TIA Quote
PT20J Posted March 16, 2020 Report Posted March 16, 2020 1 hour ago, Oldguy said: I get my hopes up every time I see a link for the schematics, but I have yet to find a single copy where I can read the page for mine - 24-1492. If anyone has a legible version, please let me know. TIA Maybe @M20Doc or someone else here has an old paper copy that they can get scanned. Both the file I got from Mooney and the link above are mostly illegible for that page. If no one here has it, you might call around to some of the MSCs that have been around for a long time like Maxwell, LASAR, Top Gun. Skip 1 Quote
Guest Posted March 16, 2020 Report Posted March 16, 2020 Just now, PT20J said: Maybe @M20Doc or someone else here has an old paper copy that they can get scanned. Both the file I got from Mooney and the link above are mostly illegible for that page. If no one here has it, you might call around to some of the MSCs that have been around for a long time like Maxwell, LASAR, Top Gun. Skip I have paper copies of some, they are quite large. I’m not sure how I’d scan them at work on a desktop scanner. Clarence Quote
EricJ Posted March 16, 2020 Report Posted March 16, 2020 1 hour ago, Oldguy said: I get my hopes up every time I see a link for the schematics, but I have yet to find a single copy where I can read the page for mine - 24-1492. If anyone has a legible version, please let me know. TIA Ouch, that one is pretty bad. 2 minutes ago, M20Doc said: I have paper copies of some, they are quite large. I’m not sure how I’d scan them at work on a desktop scanner. Clarence A good photograph is just as useful. The trick on a large document is good, even lighting, getting it flat, shot straight, etc. Quote
PT20J Posted March 16, 2020 Report Posted March 16, 2020 45 minutes ago, M20Doc said: I have paper copies of some, they are quite large. I’m not sure how I’d scan them at work on a desktop scanner. Clarence Clarence, A commercial copy or blueprint shop would have a large format scanner. Easy to try @EricJ's suggestion and see if you can get a better copy. Skip Quote
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