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Old 07-21-2019, 11:29 PM   #1
RV2019
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Default Coach charging solenoid

Got to overnight stop a couple hours ago and coach batteries were close to same SOC as this morning when we left. I think the solenoid is WHITE RODGERS 586-902. I have a 2017 Wonder.

Batteries are currently charging with the generator.

Can the solenoid be checked? Is it possible that a fuse has blown? Not really sure what to check.

Is this an item that can be purchased at an auto parts store?
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Old 07-21-2019, 11:50 PM   #2
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Default Coach charging solenoid

Solenoid can definitely be defective as AMSOLAR had to replace ours.


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Old 07-22-2019, 12:10 AM   #3
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Default Re: Coach charging solenoid

The White Rodgers solenoid failed on my 2016 Serenity after about a year. The contacts were grayed and pitted and because they are recessed into a plastic opening, it is impossible to clean the contacts. I replaced with a Cole Hersee and have had no problems. The Cole Hersee has the battery studs on the side instead of the top but I was able to bend the battery wires enough to make it work.
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Old 07-22-2019, 12:13 AM   #4
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Default Re: Coach charging solenoid

So you have the Cole Hersee part #? And where did you get it?
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Old 07-22-2019, 12:23 AM   #5
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Default Re: Coach charging solenoid

first step is to find the solenoid, and verify it is bad.

Your Ford may be wired differently than the sprinters (which have the solenoid under the passenger seat)

my experience is that a failed solenoid shows up as a much more discharged battery after a drive, since the fridge on auto will use the coach battery to run the fridge, thinking the engine is charging the system.

once you find the relay (solenoid), you will need a voltmeter to further troubleshoot.
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Old 07-22-2019, 12:28 AM   #6
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Default Re: Coach charging solenoid

with the engine off, the voltage on the large solenoid connections should match voltage readings (reference to chassis ground) for the coach battery, and the engine battery. due to charging differences, these will be different.

with the engine started, after a few seconds, (ten or so) there should be voltage (around 14 volts) applied to the small wire, which energizes the relay. then the large wires should read almost the same voltage.

if the small wire gets voltage, and the large wires stay different, the solenoid needs to be replaced.

if the large wires do not each show a voltage matching the coach or engine battery, you likely have a large fuse blown.

Are you running the standard lead-acid house batteries which came with the coach?
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Old 07-22-2019, 12:28 AM   #7
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Default Re: Coach charging solenoid

Some Autoparts stores may carry them ... other good brands are Cole Hersee and acceptable is Stinger.

Another place to ask is RV Service Centers (or even Camping World shops)

--dick
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Old 07-22-2019, 12:38 AM   #8
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Default Re: Coach charging solenoid

Quote:
Originally Posted by RV2019 View Post
So you have the Cole Hersee part #? And where did you get it?
I just got mine off E-Bay. Amazon, or many electrical supply houses will carry them. Get a 200 amp continuous duty, 12 volt unit. It is a very common solenoid. Almost any Marine supply house can fix you up,.... but do locate the old one, take a picture to be sure different style will work, plus a picture helps insure you won't get any wires mixed up. Be sure to disconnect the ground wires on the batteries (both house and vehicle) to prevent any sparks. I found that my solar was still connected and had a small spark when connecting, but not enough to worry about. On the Serenity, LTV decided to install it on the driver's side under the dinette seat, mounted on a plywood board. Mine was not in the Mercedes section of the vehicle.
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Old 07-22-2019, 12:51 AM   #9
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Default Re: Coach charging solenoid

here is a suitable Cole Hersee: https://www.amazon.com/Cole-Hersee-2...rintersou02-20
(with help-the-forum tag affixed)

"Cole Hersee 24213 12V 200A Continuous Solenoid"

ColeHersee200.jpg

The big wires go to the two terminals on the side, they don't care which side is "House".
The little wires go on the little terminals (they don't care which is "hot" and which is "ground")

--dick
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Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
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((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))

Last edited by autostaretx; 07-22-2019 at 12:56 AM.
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Old 07-22-2019, 01:09 AM   #10
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Default Re: Coach charging solenoid

The voltage on the large terminals match engine (12.8) and house (13.3) voltages with engine off.
Small wire is 0.

Engine on
Engine battery 14.32
House battery 14.48
Small wire 14.36

Now I’m lost. Seems solenoid is working.

Just started engine again and according to my VictronConnect smart bmv it shows charging at 27.9 amps 14.11 volts and 95% SOC. I had run the generator for about and hour and a half to charge batteries after we stopped.

Does this mean the solenoid has intermittent issues?

Running 2 6 volt agm batteries. Originals were 12v flooded.
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