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Old 11-27-2017, 01:33 AM   #1
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Default 12volt problem in coach

I have no 12 volt power in my coach from batteries. However, I do when plugged into 110 At first I thought it was my coach batteries being dead. However, they test fine. When pressing the switch to turn on 12volt power, I hear a solenoid clicking, but no 12volt power other than a small indicator light going on. However, when plugging into 110v, everything is fine. Obviously something has happened somewhere, but I do not know how to proceed.

Any suggestions? Thanks in advance!
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Old 11-27-2017, 02:15 PM   #2
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When plugged in, your converter is supplying 12 power to your plugs. I would find your solenoid and test for 12 volts when your switch is on. Your solenoid may have given up making a connection when energized. If bad, replace with a continuous duty solenoid rated at least 200 amps.
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Old 11-28-2017, 01:57 AM   #3
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Thanks for the response. You were correct with your analysis. When testing, there was no 12v on the coach side of the solenoid. However, I was able to temporarily solve the problem by repeatedly and quickly energizing and de-energizing the solenoid until 12v power became available. Either the solenoid was stuck or there was corrosion on the contacts that became cleared. How long this "fix" will last is, of course, not known.

The solenoid is in a very inaccessible place, hence replacement is not practical with my current travel plans. However, I do want to get a replacement on hand. In looking at Amazon I could not find one similar to my solenoid. My unit has a four wire harness coming to the solenoid for controlling it plus two 5amp blade fuses, one on each side of the body. It has the normal red and white wires to the front of the solenoid but there is a green and brown wire going towards the rear, one on each side. The switch on the coach control panel is spring loaded and only has one position--each push either energizes or de-energizes the solenoid. Do you have any suggestion where I could find such a solenoid? I cannot easily access it to get a name or model.

Thanks again for the help!
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Old 11-28-2017, 02:28 AM   #4
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Most likely you have an Intellitec bi-stable battery disconnect relay. I had intermitted problem with mine and replaced it with a new one. Mine was 2 years old. I took the old one apart and contact contamination was a problem, cleaned the contact and have a spare.
https://www.amazon.com/INTELLITEC-01...c+01-00055-000

Bluesea bi-stable relays have better silvered contacts - https://www.bluesea.com/products/770...enoid_-_12V_DC.
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File Type: jpg ZZGR3433.jpg (320.5 KB, 5 views)
File Type: jpg ZZGR3434.jpg (263.1 KB, 5 views)
File Type: jpg ZZGR3436.jpg (303.0 KB, 16 views)
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Old 11-28-2017, 05:10 AM   #5
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Quote:
Originally Posted by gksmith View Post
.................. I cannot easily access it to get a name or model................
An endoscope can help, some are for iPhone some for Android https://www.amazon.com/DBPOWER-Water.../dp/B00JERRES6
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Old 11-28-2017, 05:51 PM   #6
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Quote:
Originally Posted by GeorgeRa View Post
Most likely you have an Intellitec bi-stable battery disconnect relay. I had intermitted problem with mine and replaced it with a new one. Mine was 2 years old. I took the old one apart and contact contamination was a problem, cleaned the contact and have a spare.
The key to providing a long life for all power relays is to avoid energizing them, and particularly de-energizing them, under heavy loads.
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Old 11-28-2017, 07:15 PM   #7
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Quote:
Originally Posted by cruising7388 View Post
The key to providing a long life for all power relays is to avoid energizing them, and particularly de-energizing them, under heavy loads.
Indeed, but I am not sure that this was the cause of failure on my relay. An indication that it was the arcing failure would be contact surface pitting which just wasn’t there. I cleaned the grease off of the surface and it copper surface was like new. Most likely something happen with this grease, perhaps humidity?, temperature? resulting in high grease viscosity preventing actual copper to copper contact.

I talked to the factory engineer and was told that all of their relays contacts are lubricated with some type of contact grease. I found that this problem is not uncommon and relays can be cleaned and lubricated. http://www.irv2.com/forums/f115/solv...ms-229047.html This is the grease recommended by someone on the RV forum. https://www.amazon.com/Camco-55013-P.../dp/B0024E71JI
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Old 11-28-2017, 07:31 PM   #8
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[QUOTE=GeorgeRa;65271]Most likely you have an Intellitec bi-stable battery disconnect relay. QUOTE]

Well, the 12v did not connect again today, whereas everything was fine yesterday. Again, repeatedly energizing and de-energizing the solenoid fixed the problem. But I am getting quite nervous now.

I saw the Intellitec bi-stable battery disconnect relay on Amazon, but in the question section, one user stated I need a switch that enables reverse polarity to de-latch the solenoid, hence I did not believe it was the correct one. My switch is a spring loaded rocker switch with only one position. Plus the Intellitec does not show the fuses nor extra wires that I have.

Any other suggested solenoids?
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Old 11-28-2017, 08:27 PM   #9
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[QUOTE=gksmith;65282]
Quote:
Originally Posted by GeorgeRa View Post
Most likely you have an Intellitec bi-stable battery disconnect relay. QUOTE]

Well, the 12v did not connect again today, whereas everything was fine yesterday. Again, repeatedly energizing and de-energizing the solenoid fixed the problem. But I am getting quite nervous now.

I saw the Intellitec bi-stable battery disconnect relay on Amazon, but in the question section, one user stated I need a switch that enables reverse polarity to de-latch the solenoid, hence I did not believe it was the correct one. My switch is a spring loaded rocker switch with only one position. Plus the Intellitec does not show the fuses nor extra wires that I have.

Any other suggested solenoids?
Service manual for these relays:

https://www.intellitec.com/assets/pd...-100_rev_c.pdf
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Old 11-28-2017, 09:24 PM   #10
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There are a few of them, see the link. I would suggest to remove the relay and then make a decision: replace with the same one or a better one, or fix it. The symptoms which you are describing are very similar to my issues with the relay. As far as I know Intellitec is the most popular in the RV world, just having a single pole momentary switch doesn’t mean you don't have the Intellitec relay, could be that the RV manufacturer tried to simplified the wiring to the remote switch and added a polarity switching device next tot the rely. The relay has 2 fuses, 1 on each side.

https://www.google.com/search?q=bi-s...h=1260#imgrc=_

My relay wasn’t easy to be removed, since I made a 5 minutes job if necessary.
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