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Old 12-06-2022, 10:23 PM   #1
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Household 12V Solenoid

Does anyone know where I can buy the 4 post 12V DC constant household solenoid? Mine is manufactured by Master Electronics NI-4412A Los Angeles, CA
I lost 12V domestic service a few years ago as Camping World was installing an awning. A tech said it was the solenoid but when I came back voila, 12V was working. I noticed a ding in the rim of the solenoid so I think they whacked it and got the contact to function. Last week my 12V mysteriously quit again so after fooling around n whacking it myself to no avail I think I'll just replace it. Thanks for any suggestions. 2000 Monaco Dynasty 40' DP
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Old 12-07-2022, 12:30 AM   #2
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I looked around the internet a bit and found 2 sources.

First is a Master Electronics brand, same number as yours. It is at PDX RV Wholesale in Portland, OR. I tried to copy a link to it and failed. Can look them up and search by the part number, but trying to copy the URL fails. Their part is almost 3 times the price of the second choice, as well.

Second is made by Cole Hersee and rated 5 amps higher. Cole Hersee is an old reliable company that makes reliable parts. It is exact replacement.

https://www.walmart.com/ip/Cole-Hers...030394dc54d716
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Old 12-09-2022, 07:33 PM   #3
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Any auto store carries these solenoids, would look for 100 amp continuous.


https://www.etrailer.com/Accessories...PK5230701.html
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Old 12-13-2022, 10:37 AM   #4
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Thanks for the assistance. One member found one at Walmart of all places but it's 85A rated.... do you think that would work ok? It's only $50
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Old 12-13-2022, 10:50 AM   #5
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Well here we go... as strange as it was my 12V house service went down and as I was checking it all out a week later as I was tinkering it suddenly came back on! I'm still replacing the solenoids as preventive maintenance. The question is will the 85A solenoid be a safe replacement? I believe the schematic shows it should be 100A... hmmmm
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Old 12-13-2022, 11:32 AM   #6
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It needs to be continuous duty.

The amp rating is determined by the builder to carry the amp draw of everything 12 volts.
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Old 12-13-2022, 07:53 PM   #7
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Quote:
Originally Posted by denforent View Post
Well here we go... as strange as it was my 12V house service went down and as I was checking it all out a week later as I was tinkering it suddenly came back on! I'm still replacing the solenoids as preventive maintenance. The question is will the 85A solenoid be a safe replacement? I believe the schematic shows it should be 100A... hmmmm
The Cole Hersee solenoid is rated at 85 amps. The solenoid you have now is only rated at 80 amps. I suggested the Cole Hersee because it was better than yours and reasonably priced. Using a 100 amp rated solenoid would be a fine choice as long as it is constant duty rated. I believe NAPA auto parts has one under Part #: PHI 54140. It sells for around $65.
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Old 12-21-2022, 01:04 PM   #8
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Ditto on 100 amp continuous duty, Napa auto parts should have in stock.
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Old 12-21-2022, 03:47 PM   #9
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I would replace it with a latching type solenoid. Then you just need to change the switch to momentary.

You need to find the latching solenoid that takes the same pulse to latch and unlatch. Some need reverse polarity and need to much rewiring.

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Old 12-22-2022, 07:15 AM   #10
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Does this one fit the bill twinboat. It's in my save for later. The style is different than most newer ones but some wire/cable slack might work out.
Cole Hersee 24200 Latching Solenoid https://a.co/d/ehKWAKu
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I would replace it with a latching type solenoid. Then you just need to change the switch to momentary.

You need to find the latching solenoid that takes the same pulse to latch and unlatch. Some need reverse polarity and need to much rewiring.

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Old 12-29-2022, 10:40 PM   #11
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Here is another different idea…

I took out the two Cole Herse solenoids and replaced them with a Victron smart BP-65’s. (battery protect - 65 amps).

In my rig 65 amps were plenty- they do make a 100 & 220 amp units.

I did it for the following reasons.

Stop the amp draw. Since we full-time and boondock lots - saving the amps is very good.

If the battery gets low - they will automatically shunt off and automatically turn on when volts are back up (user setable with the smart ones).

One died - so I replaced both.

I really like the auto shutdown feature- gives me great piece of mind.
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Old 12-30-2022, 05:47 AM   #12
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Quote:
Originally Posted by 153stars View Post
Does this one fit the bill twinboat. It's in my save for later. The style is different than most newer ones but some wire/cable slack might work out.
Cole Hersee 24200 Latching Solenoid https://a.co/d/ehKWAKu
Yes, but you'll need to use a momentary switch.

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Old 12-30-2022, 12:31 PM   #13
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It's one I found that doesn't need a , a ground ' extra wiring and a a fancy switch. Just easy install for those with old continuous solenoid . The other reverse polarity to switch solenoid could be changed out to it as well with a bit of rewiring.
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Yes, but you'll need to use a momentary switch.

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