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CwazyWabbit

TD5 instrument retrofit, fuel shows max, faulty speedo. (fix)

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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.

TD5SpeedoMosfet.thumb.jpg.ea904d421e34390207ff3794e0a0b0a0.jpg

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. 

 

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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 :) 

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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 👍

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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 🙄

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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 :) 

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