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Old 10-03-2014, 05:26 PM   #1
Winnebago Owners Club
Join Date: Oct 2012
Location: Claremore, Ok.
Posts: 57
2007 Winnebago View Charging Solenoid Pics

I replaced the orignal House battery charging/BOOST Starting solenoid with a Cole Hersee Part number 24106. It's rated for 85 amps and the original one was rated for 125 amps. I never intended to use the 85 amp replacement to help start the van's engine so I felt and Winnebago agreed that 85 amps was sufficient if only used for charging. This was in July of 2013 when I was in the Whitehorse in the Yukon. NAPA was my only choice at that time.

Well I had low battery issues recently while in Canada that I thought might be another charging solenoid issue. Replaced the solenoid with another Cole Hersee #24106. Turned out to be bad batteries.

I had used the Cole Hersee #24196 85 amp solenoid I replaced to start the engine (used Boost Switch) on 3 occasions when a negative cable failed on the engines battery. It had also been charging the batteries for over a year.

I decided to cut the solenoid apart and see if the 3 engine starts or the battery charging had burned the solenoid's contacts. As you can see from the pics there are no signs of arcing or overheating anywhere.

Top of solenoid off:


Washer sets on contacts to complete the circuit when the coil is energized.

Bottom of copper washer (Connects the two contacts together for battery charging or BOOST Starting)


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Old 10-08-2014, 11:21 PM   #2
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Nice pictures, I like the idea of the round contact surface, lots of cooling mass for arc suppression. Unless your 2007 is different than my 2005 Adventurer, the boost solenoid is only activated by the boost switch and doesn't normally charge the house batteries. Please correct my assumption if I'm wrong. That being said, I have played with the though of using it to connect the alternator output and the house batteries when driving, for the obvious purpose of charging the house batteries. I have used it once or twice to boost the starting battery for the engine, and a couple of times to boost the house batteries when starting the genny after pulling current in a boondock situation where quiet was enforced.
Problem is I don't know how robust the actuating solenoid is, (rated continuous operation?) If you look on eBay there seem to be some Chinese circuits with both voltage sensing and delay times that are made to drive a relay just for this charging/boost purpose.
FYI, Arcing in contacts is minimal when making up, but much greater when breaking the circuit. Current load is not excessive until you actually turn the key to start. 13.5 v to 10.5 V batteries is 3 volts and assuming 0.05 ohms, that's only 60 amps on makeup of the contacts. And if you don't release the boost switch until the engine starts, the current flow is probably well within that 85 amp rating. Actually by that time I think current is flowing back into your house batteries from the alternator.

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Old 10-10-2014, 06:51 AM   #3
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Join Date: Oct 2012
Location: Claremore, Ok.
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I verified with Winnebago that this solenoid does charge the house batteries and when you activate the BOOST switch it connects the house batteries to the engine battery. It apperas to be a good fit for this application.

The original solenoid installed at the Winnebago factory failed soon after we bought the motor home in 2007.
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Old 10-10-2014, 06:04 PM   #4
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Join Date: Oct 2012
Location: Claremore, Ok.
Posts: 57
Cole Hersee 24106 Solenoid specs.
Solenoids & Relays24106 | Cole Hersee - Littelfuse
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