Davidv Posted October 18, 2019 Report Share Posted October 18, 2019 I know this is a shot in the dark but while changing the oil yesterday I noticed this wire and I’m not sure if I nudged it out of its harness or if it was like this prior. It’s extremely small so it’s not out of the question that it had been tugged enough times and finally broke. I’ve circled the wire as well as the only other wire I see past the white tape that could be the other end. After that it disappears inside larger bundles so I’m not able to trace. Any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
RLCarter Posted October 18, 2019 Report Share Posted October 18, 2019 It looks cut not pulled part. Cant tell on this small screen but the circle in upper left is the other end? 1 Quote Link to comment Share on other sites More sharing options...
Davidv Posted October 18, 2019 Author Report Share Posted October 18, 2019 Yes, that's what it looks like but I was also thinking that the wire is so small that a break could look like a cut. I'm not sure if that's the other end, but I can't find any other wires around there that are the same type besides that one. Quote Link to comment Share on other sites More sharing options...
RLCarter Posted October 18, 2019 Report Share Posted October 18, 2019 Best thing would be trace the wire and see what it goes to in the engine compartment (easiest) and go from there. It seems to be common practice to cut wires and leave them in place for some reason. By chance is the wire labeled (printed) as to what it is? Might have to check along the length to see 2 Quote Link to comment Share on other sites More sharing options...
StevenL757 Posted October 18, 2019 Report Share Posted October 18, 2019 Find out how far left and/or right (from the picture) it goes...does it go to the firewall and into the cockpit, or elsewhere? If you can see/trace both ends of it in the engine compartment - meaning, neither end is connected to anything - it's probably ok to remove it. Depending on what work you had done recently, may want to cross check with your avionics and A&P folks whether they know anything about it. Steve 1 Quote Link to comment Share on other sites More sharing options...
Davidv Posted October 18, 2019 Author Report Share Posted October 18, 2019 Thanks @StevenL757 and @RLCarter, I plan on tracing it but out of curiosity wanted to see if it was familiar to anyone since it's so different from any of the other wires coming out of the firewall. 2 Quote Link to comment Share on other sites More sharing options...
N201MKTurbo Posted October 18, 2019 Report Share Posted October 18, 2019 My guess is it is the ground wire that went into that heat shrink behind it. It probably grounded the shield of that cable. 1 Quote Link to comment Share on other sites More sharing options...
Cruiser Posted October 19, 2019 Report Share Posted October 19, 2019 anyone that cuts a wire, leaves it bare and unmarked should be taken out and hung by their thumbs. Drives avionics techs to pound the desk in disgust. Whatever you do, don't guess. Make sure you know where it goes. Quote Link to comment Share on other sites More sharing options...
Davidv Posted October 19, 2019 Author Report Share Posted October 19, 2019 Agreed, especially when I try to trace all of the tubes and bundles that split 2 or 3 times downstream. My wiring diagram: Quote Link to comment Share on other sites More sharing options...
carusoam Posted October 19, 2019 Report Share Posted October 19, 2019 Another thing to try... see if the two broken ends can be pulled close to each other... if they stop just short of touching... it seems more possible that it broke under stress? see if you can read any wire numbers printed on any of the wires it is bundled with... this may give a hint to who it is... PP thoughts only, not a mechanic... Best regards, -a- Quote Link to comment Share on other sites More sharing options...
larryb Posted October 19, 2019 Report Share Posted October 19, 2019 You need this to help trace the wire. https://www.amazon.com/Tracer-Circuit-Tester-Alligator-PTE/dp/B00ADHQCIO/ref=sr_1_17?crid=1FXKESVNJBUZH&keywords=wire+toner+kit&qid=1571517460&sprefix=Wire+toner%2Caps%2C228&sr=8-17 Quote Link to comment Share on other sites More sharing options...
Davidv Posted October 20, 2019 Author Report Share Posted October 20, 2019 Thanks everyone, quick update, I fired up the engine yesterday and so far no gauges seem to be inop. However, I’m going flying today and will see if the TIT gauge functions as that obviously wouldn’t indicate anything on the ground. Quote Link to comment Share on other sites More sharing options...
Gagarin Posted November 7, 2019 Report Share Posted November 7, 2019 On 10/18/2019 at 8:21 PM, Davidv said: Agreed, especially when I try to trace all of the tubes and bundles that split 2 or 3 times downstream. My wiring diagram: What city is this? Quote Link to comment Share on other sites More sharing options...
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