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Old 07-06-2015, 03:29 PM   #1
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Frig Fan Wiring

We have a Norcold N61 frig. I want to add an external fan to the bottom back of the unit via the outside access door. I don't have a question about the fan or location- discussions about these items, temp switches, etc, elsewhere.

There are 2-12v positive wires and 2-12v negative wires going into the frig power/control box pictured. I can splice the fan wires to one each of these + and - main frig wires, matching polarities. Also put in a 1A fuse on the + fan wire. The fan will be on a rheostat to control speed/noise.

Should this cause any problem for the frig operation?
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Old 07-07-2015, 07:12 AM   #2
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Originally Posted by garybo View Post
We have a Norcold N61 frig. I want to add an external fan to the bottom back of the unit via the outside access door. I don't have a question about the fan or location- discussions about these items, temp switches, etc, elsewhere.

There are 2-12v positive wires and 2-12v negative wires going into the frig power/control box pictured. I can splice the fan wires to one each of these + and - main frig wires, matching polarities. Also put in a 1A fuse on the + fan wire. The fan will be on a rheostat to control speed/noise.
Should this cause any problem for the frig operation?
garybo
Splice into the pair that supplies the 12V power TO the control box. (aka: the wires going TO the control box)
If both pairs of wires are "going to" the control box splicing into either pair will not be a problem.
HOWEVER if one pair is "coming out of the control box" I would NOT splice into that pair!
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Old 07-07-2015, 11:19 PM   #3
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Thanks Mel
You say splice into the + positive wire going to the control box, but don't use the - negative (ground) coming out of the control box, ie, find another ground?
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Old 07-07-2015, 11:52 PM   #4
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Thanks Mel
You say splice into the + positive wire going to the control box, but don't use the - negative (ground) coming out of the control box, ie, find another ground?
garybo
What I am saying is splice into the pair of 12V wires, both the positive (+) and the negative (-), carrying 12VDC TO the control box...but NOT into the pair of wires (+) and (-) carrying 12VDC OUT OF the control box.

However splicing only into the (+) wire going to the control box and finding another ground (-) as an alternative to splicing into the negative (-) will work perfectly fine.

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Old 07-08-2015, 06:10 PM   #5
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OK Mel, I understand.
Thanks,
Gary
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Old 07-08-2015, 06:44 PM   #6
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Well, actually I don't understand.

The 2 + 12v wires go to the SAME terminal on the above LEFT. My Fluke meter display reads +12.9v on both of these wires, measured to each of the - wires, so I don't know which is going "in" or "out".
Can my meter or something else tell me which is "in" and "out"?
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Old 07-08-2015, 06:59 PM   #7
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The 2 pairs of wires shown in your photo are the ones you want to connect/splice to. Connect the +12vdc for your fan circuit to either of the 2 wires connected to the +12vdc on the board in your photo and connect the - (ground/negative/0vdc) for your fan circuit to either of the 2 wires connected to the GND on the board. You should be fine. I assume you are using a computer type fan that draws less than 0.5 amp/ 500ma.


see the last page of the instructions here: http://www.thetford.com/wp-content/u...2306-21907.pdf
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Old 07-08-2015, 07:42 PM   #8
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I did that only used AC power, not 12 volt. Plugged it into the back of the refer (Dometic) and controlled the on/off function by a remote located inside the RV.
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Old 07-08-2015, 08:27 PM   #9
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Thanks Russ. Yes, using a computer fan.
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