CwazyWabbit Posted November 25, 2019 Share Posted November 25, 2019 Just wanted to store this info somewhere, thought this would be a good place. Looked at a TD5 speedo that had been retrofitted and the fuel gauge was showing max all the time, swap out proved fault as speedo head itself. After a bit of tracing the mosfet circled in the picture was found to be faulty. An MMBF170 (sot-23 package) works as a suitable replacement. N:B if instead you are suffering with the faulty fuel warning light instead see my post at the end of this thread for the component to replace. 3 Quote Link to comment Share on other sites More sharing options...
Green200tdi Posted November 27, 2019 Share Posted November 27, 2019 My td5 speedo? Very hi tech in there 😳 1 Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted November 27, 2019 Author Share Posted November 27, 2019 Yep, that's yours. I should have taped the faulty mosfet to the speedo before I sent it back so you could see the size of the thing that caused all the problems. I always get the good ideas too late Quote Link to comment Share on other sites More sharing options...
Green200tdi Posted November 27, 2019 Share Posted November 27, 2019 1 hour ago, CwazyWabbit said: Yep, that's yours. I should have taped the faulty mosfet to the speedo before I sent it back so you could see the size of the thing that caused all the problems. I always get the good ideas too late Pop a photo on here 👍 Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted November 27, 2019 Author Share Posted November 27, 2019 1 Quote Link to comment Share on other sites More sharing options...
Simon Smith Posted November 27, 2019 Share Posted November 27, 2019 That's quite a large component for you. 1 Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted November 27, 2019 Share Posted November 27, 2019 Wow that's quite small ! Mo Quote Link to comment Share on other sites More sharing options...
Green200tdi Posted November 27, 2019 Share Posted November 27, 2019 This man is worth his weight in gold I can’t thank him enough 😊 note to self don’t push the plug in to hard next time 🙄 Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted November 27, 2019 Author Share Posted November 27, 2019 I'm not sure how the plug pushing in did the damage, unless perhaps it somehow resulted in a sort circuit of the output. Oh well, works now and a little more knowledge for the hive mind Quote Link to comment Share on other sites More sharing options...
Green200tdi Posted November 30, 2019 Share Posted November 30, 2019 Happy chappy all working thank you Barry👌 Quote Link to comment Share on other sites More sharing options...
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