3 way fridge 12V voltage level - SOLVED

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  AnOldUR Member Posts: 1,292

  October 2021 edited October 2021

  Can't explain except to say that we removed our 3-way fridge in favor of a 12V slide-out chest and used the existing 12V line. With a rested battery, we get the same voltage there as at the battery (or any other place). Works great!
  

  Stockton, New Jersey
  2020 nuCamp T@B 320S * Jeep Wrangler
  

  
  

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  webers3 Member Posts: 404

  October 2021

  Thank you @AnOldUR, I am actually following your plan to replace the 3 way. This has me stumped. 

  2017 T@B 320S   2019 Jeep Cherokee - Southern Connecticut
  

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  Denny16 Member Posts: 5,431

  October 2021

  You either have a small resistance short in that wire, or a bad splice/connection point.  Try disconnecting the wire from the power converter at the fuse connection, measure the voltage at the fuse load side, if it is 12.x VDC, then next, cut off the wire ends and re connect them, if still getting a voltage drop, trace the wire, there is an issue somewhere along the wire run.  
  

  cheers
  

  2018 TaB400 Custom Boondock,  Jeep Gladiator truck, Northern California Coast.

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  AnOldUR Member Posts: 1,292

  October 2021

  To add to what @Denny16 said above, if your 2017 320S is the same as my 2020, the fuse is a 20amp at F4 location and the refrigerator is the only thing in that circuit.
  

  Stockton, New Jersey
  2020 nuCamp T@B 320S * Jeep Wrangler
  

  
  

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  webers3 Member Posts: 404

  October 2021

  @Denny16 so that wire runs straight from the fridge to the converter? @AnOldUR by F4 location you mean the auto style fuse?

  2017 T@B 320S   2019 Jeep Cherokee - Southern Connecticut
  

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  AnOldUR Member Posts: 1,292

  October 2021 edited October 2021

  @webers3 ... I did not trace the wire, but when testing my battery draw I checked each circuit individually and didn't find anything else but the fridge on F4. That's also what I've read in different places. And yes, F4 is an auto style fuse.

  (the 20amp fuse at F4 is in upside-down, but this picture shows its location)
  

  Stockton, New Jersey
  2020 nuCamp T@B 320S * Jeep Wrangler
  

  
  

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  webers3 Member Posts: 404

  October 2021

  @AnOldUR Thanks again, it’s confusing because one diagram I am looking at for 2016 320 has fridge on F2 but will verify and test when I go back to it. 

  2017 T@B 320S   2019 Jeep Cherokee - Southern Connecticut
  

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  webers3 Member Posts: 404

  October 2021

  Well, that's embarrassing, it was the fuse. It didn't occur to me to check it to begin with because there was voltage, although lower, on that line. So I don't understand why there was voltage on the fridge line with the fuse out.

  2017 T@B 320S   2019 Jeep Cherokee - Southern Connecticut
  

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  Dutch061 Member Posts: 765

  October 2021

  Voltage was likely due to feedback on the ground circuit.
  
  Brad

  2020 400 BDL aka "Boonie"
  2022 Black Series HQ19 aka "Cricket"
  2021 F-250 Tremor with PSD aka "Big Blue"
  Concord, NC 

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  webers3 Member Posts: 404

  October 2021

  @Dutch061 Is that bad or ok?

  2017 T@B 320S   2019 Jeep Cherokee - Southern Connecticut
  

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  Dutch061 Member Posts: 765

  October 2021

  I'm sure it is fine, sorry to create the concern.
  
  Brad

  2020 400 BDL aka "Boonie"
  2022 Black Series HQ19 aka "Cricket"
  2021 F-250 Tremor with PSD aka "Big Blue"
  Concord, NC 

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  AnOldUR Member Posts: 1,292

  October 2021

  Glad to hear you worked it out. Out of curiosity, which slot was your fridge fuse in?

  Stockton, New Jersey
  2020 nuCamp T@B 320S * Jeep Wrangler
  

  
  

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  webers3 Member Posts: 404

  October 2021

  @AnOldUR it was in #1. Now I need some cabinet making skills so I can do what you did

  2017 T@B 320S   2019 Jeep Cherokee - Southern Connecticut
  

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  ckjs Member Posts: 64

  October 2021

  @webers3
  That phantom 11.3v was probably due to the tiny current which powers the “red fuse is blown” LED in the WFCO. The LED is usually shorted out by the fuse, but when that’s blown a trickle current runs through the light and then to the fridge or other load. 

  Charles & Judy, Santa Cruz, CA
  2018 T@B 320 CS-S; Alde 3020; 4 cyl 2020 Subaru Outback Onyx XT

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  AnOldUR Member Posts: 1,292

  October 2021

  webers3 said:

  Now I need some cabinet making skills so I can do what you did

  My cabinet making skills are all but nonexistent. I faked it by repurposing the wood from when I pulled out some of the rear cabinetry. The face panel on my pullout is the lid for the rear storage compartment cut down to fit.

  
  

  Stockton, New Jersey
  2020 nuCamp T@B 320S * Jeep Wrangler
  

  
  

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  Viajero Member Posts: 123

  October 2021

  Glad it worked out for you. What model did you replace it with?

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  webers3 Member Posts: 404

  October 2021

  @Viajero Replacing it with ICECO JP50, have used it for over a year and so far so good. Set the temp and forget it, unlike the 3 way

  2017 T@B 320S   2019 Jeep Cherokee - Southern Connecticut
  

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