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Old 06-20-2012, 04:51 PM   #1
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Newmar Owners Club
Ford Super Duty Owner
Join Date: Sep 2011
Location: Overland Park, KS
Posts: 27
12 Volt power problem

I have a 1996 Newmar Kountry Aire motor home. It has a remote power disconnect for storing the coach. Something is wrong with the 12 volt house power. I have a good strong 12 volts from the house batterys (2 @ 12 volt) all the way up to the upper side of a coil in the system that says on the side: White-Rodgers 120-105751-6 COIL 12V DC CONT. --- on the lower side of that coil and all through the coach the voltage drops to 6 to 7 volts, and it wavers back and forth between 6 and 7 volts at about a 100 waves per minute rate. I can replace that coil, but I hate to do that without knowing if there is some other problem and the coil is just where is shows up. I don't even know what that coil does, or why it could be causeing a drop in voltage.
Any thoughts or words of wisdom would be appreciated.

Chuck in Kansas City
1996 Newmar Kountry Aire
38' class A Motor Home
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Old 06-20-2012, 06:27 PM   #2
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Join Date: May 2009
Location: Bluff Dale, TX
Posts: 565
It is a solenoid. It is known as the coach battery disconnect.
The solenoid has a copper plate inside that connects the two big cables electrically. After it is used for a while they fail when the copper plate doesn't make good contact. This is happens faster when there are powered loads on the circuit when the contacts make and break. Arcing burns the contacts and they don't make good contact. That is the cause of the low voltage. Replace it.

Most RV batteries live a long and useful life, some are murdered.
2000 National Sea Breeze F53
1998 CRV Toad
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Old 06-21-2012, 08:06 PM   #3
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Join Date: Sep 2011
Posts: 14
Gary is right, the only thing I would add is that you don't have to find the exact same brand solenoid. You can get one at any auto part store. Just disconnect all your vehicle batteries, remove the solenoid, and bring it in to the store. Make sure you put the wires back in the right places on the new solenoid. There should be one from the battery/batteries, and one or more to the coach. You can wrap the ones that go together with tape so you don't get them mixed up.
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