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Old 05-27-2016, 10:27 AM   #1
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Odd fridge and separator behavior?

Having some issues with my 02 battery system and hoping someone can help out

Been seeing the house battery voltage drop when the fridge kicks on down to 11.8 or so and when it stops running it goes right back to the 12.6-12.7v, inspected and made sure any connections and ground wires were tight. The house battery is a 2yr old Deka 4D.

Currently camping and I have my Overland Solar portable panel setup and the volt meter will show 12.9-13.1v while the fridge is not running and down to 11.8 when running. Also as soon as the fridge kicks on the separator or isolator (whatever SMB installed in the 02s) clicks.

Could that on the way out? Any field fixes or anything else to check out?? Seems to charge fine when driving and my starter batteries show 12.7 just sitting here not running and they are 3yrs old too

Thanks guys,


D

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Old 05-27-2016, 10:29 AM   #2
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I've had the same issue with bad battery ground.. You say you checked battery grounds though. Did you check fridge wiring as well?
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Old 05-27-2016, 10:35 AM   #3
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I checked the ones I could get at w/o dropping the house battery, and I pulled out the fridge the other day and all was good behind it....
Stumped. Hoping I don't need to drop the house battery again....

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Old 05-27-2016, 11:14 AM   #4
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Ok, where the heck does SMB hide the isolator/separator on 7.3l diesels? The smb manual showed under the coolant tank. Swung it out of the way and it ain't there.

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Old 05-27-2016, 11:53 AM   #5
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Ok, where the heck does SMB hide the isolator/separator on 7.3l diesels? The smb manual showed under the coolant tank. Swung it out of the way and it ain't there.

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That's where they generally are.

But check on the frame rail by the secondary battery as well.
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Old 05-27-2016, 12:22 PM   #6
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I agree with RPA. A large voltage drop under load most often indicates a bad battery with little reserve capacity, but since yours isn't that old the next suspect would be a bad connection (either the ground or positive side would do it) After checking all the easy stuff, you will probably need to drop the battery to check it. My house batterys (2-6 volts)were grounded by a simple bolt through the frame that was corroded. After I cleaned it all up, I saw better charging performance.
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Old 05-27-2016, 12:55 PM   #7
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Grrrrr.... Guess I'll drop the house battery when we get home. Not gonna try to w/o the floor jack

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Old 05-27-2016, 01:06 PM   #8
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I just had the same issue and it was the ground to the body that was the first point of contact from the house battery. If you follow the power wire on your alternator it should get you to the separator.


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Old 05-27-2016, 01:11 PM   #9
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I just had the same issue and it was the ground to the body that was the first point of contact from the house battery.

My plan is to run a heavy ground wire from the house batterys directly to the alternator. That project is near the top of the list. I'm not sure how or where Sportmobile attaches the ground, but perhaps it's outside the battery box so you don't have to drop it. A floor jack cross beam like one from Harbor Freight for around $40 would probably make it easier and safer to drop the battery. Add in an air ratchet and it sould be pretty quick.
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Old 05-27-2016, 01:40 PM   #10
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I'm not sure how or where Sportmobile attaches the ground, but perhaps it's outside the battery box so you don't have to drop it.
Usually directly onto the frame near the aux battery.
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