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Thermistor value for 120v charging cord?

repair charging cord thermistor

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8 replies to this topic

#1 OFFLINE   paperbird

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Posted 02 February 2018 - 10:42 AM

Does anyone know the thermistor value for the three-prong plug assembly on the 120v charging cord? I'm trying to repair mine. The company that manufactures them, Yazaki, refuses to tell me what it is, claiming some sort of liability nonsense. If anyone could help, it'd be greatly appreciated. Thanks!









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#2 OFFLINE   jzchen

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Posted 02 February 2018 - 10:08 PM

User altabrig had an issue with his. We couldn’t figure it out I’m afraid.

Turns out there are many different thermistors to choose from...

#3 OFFLINE   paperbird

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Posted 09 February 2018 - 01:34 PM

I figured it out (I think)! The correct value is 68k, or at least that's the value that has worked to remove the fault indication on the control module. I'll see how it works out for prolonged charging times and circle back with results. I don't believe that you need to have any particular kind of thermistor to make it work. What I used was a Vishay NTC 5% Radial.  The resistance value just has to match what the control module wants to "see". For that matter, you could just use a plain old 68k resistor, although this would admittedly be less safe.


  • altabrig and spirilis like this

#4 OFFLINE   jzchen

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Posted 09 February 2018 - 08:45 PM

Wow! Great work! I’m afraid altabrig tried one 10k ohm as recommended on here, and I’m afraid may have become frustrated with the issue. (I’m afraid I wasn’t very helpful to his case at the time)....

#5 OFFLINE   altabrig

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Posted 11 February 2018 - 05:50 AM

Paperbird,

The 10k was insta fault for me.  My cord has been unusable for a few months.   I will try that vishay 68k if I can find it local.  Hope MarVac electric can get one.   Did you just solder it to the ends of the 22 guage blue and brown wires or did you do something els?   Like to hear if you can avoid fauting  when the temps rise. 

 

 Thanks this information gives me a bit of hope to get the EVSE back in service.

 

Thanks for the heads up on the post Jesse.  Much appreciated.


Edited by altabrig, 11 February 2018 - 05:53 AM.


#6 OFFLINE   paperbird

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Posted 11 February 2018 - 06:50 AM

altabrig, so far so good, but now that I know a resistance value that works, it should be relatively cheap and easy to reset the unit if I get a fault indication. To answer your question, yes I soldered the thermistor directly to the 22guage wires. That’s how they had it in the original plug assembly. My concern is that the components won’t be insulated properly, so I’d imagine I’ll have more issues once the weather gets warmer.

#7 OFFLINE   altabrig

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Posted 15 February 2018 - 08:03 AM

Thanks PaperBird.   I will get to an electrical supply sometime soon to get a 68k and see if my level 1 can be raised from the dead.



#8 OFFLINE   paperbird

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Posted 15 February 2018 - 01:21 PM

Thanks PaperBird.   I will get to an electrical supply sometime soon to get a 68k and see if my level 1 can be raised from the dead.

 

Sounds good! The new plug is working like a charm so far. I used a Leviton heavy-duty right-angle plug assembly, and then sealed it up with liquid electrical tape, so now it's waterproof like the original. I have to admit, I feel quite triumphant, as I was given the cold shoulder by both Ford and Yazaki (the cord manufacturer). They'd rather the whole thing end up in a landfill than have a consumer fix it themselves. $800 vs. $0.50 for the stupid little thermistor...shame on them!



#9 OFFLINE   altabrig

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Posted 15 February 2018 - 01:27 PM

That is awesome.   I will check out the liquid electrical if it passes the no fault test.    I just have a  leviton straight plug, a right angle would have been better.











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