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Old 02-19-2016, 04:58 PM   #1
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Battery Life

I've heard that Dometic refrigerators have an automatic defroster which will drag your batteries down within a day or two when boondocking. Is this true? If so is there a way to install an on/off switch?
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Old 02-19-2016, 05:10 PM   #2
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What Dometic fridge model do you have? It will help....
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Old 02-19-2016, 05:19 PM   #3
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Good question, I'll have to get back to you on that. I take it some do and others don't.
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Old 02-19-2016, 05:34 PM   #4
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If the little divider strip of metal that is between your fresh food compartment and the freezer is warm to the touch you have the heater.
Open both doors and just lay your finger on the metal right between
the top of the lower door and the bottom of the upper door.

Some fridges have a switch to shut the heater off.
If you have a switch it's likely located near the top of the freezer door.
Open the freezer and look right along the top edge of the freezer just above
where the freezer door seal would be if the door were shut.
It's a little rocker switch.

Warm divider means you have the dreaded "no condensation" heater.
It's 12v powered which means your fridge will be a battery hog when on
battery power. We all wonder WHY dometic didn't make the heater be
120 v ac powered then it wouldn't suck your batteries in a only a couple of
days.

Post your make and model number and we can probably help further....
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Old 02-20-2016, 11:30 AM   #5
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Battery Life

I pulled the outside cover off and pulled j2 on the control circuit board. (check schematic). That's the 12 volt heater and light. You won't have a heater or a light but you are boon docking,ha. I'm going to install an external switch on the 12 volts leaving the controller so I can flip a toggle switch to do this faster. I'm also going to install a switch on the ac heater so I don't have as much start load on my little generator.
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Old 02-20-2016, 11:38 AM   #6
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See the attached Dometic installation manual. Look at the schematic on top of page 17. Item G is your inside light. Item K is the heater strip. You can see they are both fed from the same wire on the left. To kill the heater but keep the light, you'd need to cut the wire between the heater and light. You could install a switch in this wire if desired. Of course, finding where the wire to the light and the wire to the heater connect will be interesting. I'm intending to do this, but haven't had time to look into where the wiring is at. As mentioned above, you can pull the wire off J2 at the circuit board, but then you lose the light, too.

You'll need to know your model Dometic, then find the schematic for it, and see if it has the heater strip. Not all Dometic's have it.
Attached Files
File Type: pdf Dometic Refrigerator Installation Manual DM2652.pdf (3.05 MB, 32 views)
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Old 02-20-2016, 11:50 AM   #7
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the model installed on my TT is a DMR and the heater is in a 120V circuit so I assume when on batteries and propane the heater will not come on.
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Old 02-20-2016, 01:39 PM   #8
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Yes, I have the 2652 also. There's a 12v and a 120 v heater. I wish it had a switch but I haven't located one. See the picture below of the 2652. J2 all the way to the left is the light and the 12 heater. A cheap and dirty way to get rid of the battery drain if you are camping and just want to save the battery is to unplug it. The big black ones to the right are the 120 v heater.


https://drive.google.com/file/d/0BxWjRGtBAZ68N1dtRjRwSlk4Vkk/view
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Old 02-20-2016, 08:16 PM   #9
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Quote:
Originally Posted by Too Tall View Post
Yes, I have the 2652 also. There's a 12v and a 120 v heater. I wish it had a switch but I haven't located one. See the picture below of the 2652. J2 all the way to the left is the light and the 12 heater. A cheap and dirty way to get rid of the battery drain if you are camping and just want to save the battery is to unplug it. The big black ones to the right are the 120 v heater.


https://drive.google.com/file/d/0BxWjRGtBAZ68N1dtRjRwSlk4Vkk/view
The 120v heater is for operating the fridge. The 12V heater is for the condensation strip heater around the door seal. The 2652 schematic shows a switch for the condensation heater. I think it may be item #66 on page 7 of the attached parts document. Looks like it's kind of hidden under the control panel. I have 2652 also, but haven't seen the switch. I'll have to look when spring arrives.
Attached Files
File Type: pdf Dometic Refrigerator Parts List DM2652.pdf (366.8 KB, 20 views)
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Old 02-20-2016, 10:26 PM   #10
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Great discussion! Can't wait to get into it to see the configuration.
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