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04-06-2016, 07:41 PM
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#1
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Senior Member
Monaco Owners Club
Join Date: May 2009
Location: Melbourne, Florida
Posts: 139
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Continuous Duty Solenoid Temp
In the last basement bay on passenger side of my motor home I have 2 Continuous Duty Solenoids, one for house and one for chassis. I had the chassis go bad and when i changed it out I noticed it was warm. After installing the new solenoid I felt each one and they were hot. I know they get warm but not hot. Is this normal? Batteries fully charged and motor home was not plugged into shore power. I used an infrared Laser Thermometer and the reading was 107 deg.(it felt hotter than 107 to the touch)
Bill
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2000 34' York Dynasty
2013 Jeep Wrangler Unlimited
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04-06-2016, 07:50 PM
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#2
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Member
Entegra Owners Club Retired Fire Service RVer's Spartan Chassis
Join Date: Mar 2016
Posts: 44
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24213 - Continuous Duty come in 65, 85, 200 Amp
Question is what was load rating of old Solenoid v/s your replacement?
Most replacements and automotive have copper contacts, the higher rated and quality units will have silver contacts.
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2017 Entegra Anthem 42 RBQ
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04-06-2016, 07:52 PM
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#3
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Senior Member
Join Date: Jun 2011
Location: FL
Posts: 11,403
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Absolutely normal for these solenoids. They draw 1-1.5 amps multiplied by 13.5 volts and you get enough watts to make them hot.
These solenoids should be considered normal routine maintenance replacements. I just wish I could help people understand that after 40 years of replacing tens of thousands of these in my business. They work hard and are just simple mechanical switches that endure incredible hardships. They are inexpensive in the RV world. Just think of them like changing an oil filter. Cheap and worth the preventative maintenance. You pay me now or later. If you let the solenoids go they will fail but often in subtle ways and can create amazing symptoms on the RV systems.
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Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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04-06-2016, 08:05 PM
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#4
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Senior Member
Monaco Owners Club
Join Date: Mar 2014
Posts: 916
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Quote:
Originally Posted by YC1
Absolutely normal for these solenoids. They draw 1-1.5 amps multiplied by 13.5 volts and you get enough watts to make them hot.
These solenoids should be considered normal routine maintenance replacements. I just wish I could help people understand that after 40 years of replacing tens of thousands of these in my business. They work hard and are just simple mechanical switches that endure incredible hardships. They are inexpensive in the RV world. Just think of them like changing an oil filter. Cheap and worth the preventative maintenance. You pay me now or later. If you let the solenoids go they will fail but often in subtle ways and can create amazing symptoms on the RV systems.
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What do they do?
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Jerry, "EWC (SW)" USN Retired
2003 Beaver Patriot Thunder 505 HP C-12 1550 TQ
Allison 4000MH Ram 4X4 towed
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04-07-2016, 04:37 AM
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#5
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Senior Member
Join Date: May 2011
Location: Port Dover, Ontario
Posts: 466
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After replacing my overheated solenoid exactly one year later, I came across a thread on this forum that suggested wiring a #89 bulb in series. Low resistance when cold to pick up the coil with full voltage and voltage reduced to 8 volts to hold in the coil. To date 4 months of continuous service working well for me.
What do they do?....various uses...join the house and chassis batteries for charging...connect the house batteries to the house load.
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2009 Monaco Monarch 33SFS...Jeep TJ
Wintering in Apache Junction. Summer in Ontario.
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04-07-2016, 06:10 AM
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#6
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Senior Member
Join Date: Jun 2011
Location: FL
Posts: 11,403
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A solenoid/relay is a simple device that uses an electromagnet to short contacts together. They use a control voltage or/and ground to energize and that brings the contacts together to join two circuits such as batteries or to turn on systems.
They are an electronic control valve. If you put an inline valve on a water hose this is what they do. They are just electrically controlled.
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Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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04-07-2016, 07:50 AM
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#7
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Senior Member
Monaco Owners Club
Join Date: Mar 2014
Posts: 916
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Thank you for info harris 155 and YC1. I didn't recognize the name or what they looked like as compared to my coach. I have a Big Boy isolater in my coach that serves that same function (I think).
__________________
Jerry, "EWC (SW)" USN Retired
2003 Beaver Patriot Thunder 505 HP C-12 1550 TQ
Allison 4000MH Ram 4X4 towed
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04-07-2016, 08:21 AM
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#8
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Moderator Emeritus
Monaco Owners Club Texas Boomers Club
Join Date: Nov 2015
Location: Central Texas
Posts: 13,426
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Quote:
Originally Posted by gemert
Thank you for info harris 155 and YC1. I didn't recognize the name or what they looked like as compared to my coach. I have a Big Boy isolater in my coach that serves that same function (I think).
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I may be confused, but I think the big boy solenoid serves a different function. From what I understand, it controls the charging voltage to the batteries. When plugged into shore power, it charges the house battery, then when they have a full charge, it sends the charge to the chassis battery.
Those two smaller solenoids control the voltage to the chassis and house systems. If they are not energized, the chassis or house won't have 12 volts to power the systems like lights, fridge etc.
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Dennis and Katherine
2000 Monaco Dynasty
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04-07-2016, 04:58 PM
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#9
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Senior Member
Monaco Owners Club
Join Date: Mar 2014
Posts: 916
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Quote:
Originally Posted by barmcd
I may be confused, but I think the big boy solenoid serves a different function. From what I understand, it controls the charging voltage to the batteries. When plugged into shore power, it charges the house battery, then when they have a full charge, it sends the charge to the chassis battery.
Those two smaller solenoids control the voltage to the chassis and house systems. If they are not energized, the chassis or house won't have 12 volts to power the systems like lights, fridge etc.
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Got it! Thank you.
__________________
Jerry, "EWC (SW)" USN Retired
2003 Beaver Patriot Thunder 505 HP C-12 1550 TQ
Allison 4000MH Ram 4X4 towed
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