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1Motorhome · 11-20-2019, 04:34 PM

Yesterday while doing some PM adjustments on my Coach, I was lubing and cleaning the bay doors and on my rear bay I noticed the plunger limit switch for that bay was missing. To my knowledge it has been missing since I have owned the Coach. It didn't just happen. It is one of the bay doors under my rear bedroom slide, There are two more bay doors under that slide, (large slide).
My understanding is these limit switches must be made up for the slide to operate (Safety measure), but my slide is working even in the absence of this switch. The white wire for this switch is there and it looks like all the plunger switches from all the compartments are daisy chained together from one to the other, then lead off to a ground point through the floor to somewhere in the coach.
I do intend to order a replacement because it should be there. I can't get in my mind if this is considered a NO normal open or NC normal closed switch. I found one a RV parts site for $17.00 but then found what I believe to be the same item on Amazon 2 for $6.00!! The Amazon description is a Hatch Plunger switch in the Automotive section. Looks exactly the same and dimensions are the same. But Amazon does not state if it is NO or NC??
OK, getting back to my question...why would the slide work if there is no switch to makeup the circuit?? Any ideas??

Martind4 · 11-20-2019, 05:54 PM

Could they be switches for lights in the compartments that come on when a door is opened.

falconman · 11-20-2019, 07:13 PM

Mine are involved only with the bay lights and have no impact on slide operation, probably since the doors open sideways there would be no issue of interference.

1Motorhome · 11-20-2019, 08:44 PM

Quote:

Originally Posted by Martind4

Could they be switches for lights in the compartments that come on when a door is opened.

Not for lights, my bay lights are manual on /off. In my owners manual it states that all bay doors below any slides MUST be closed or slides will not work. These switches are limit switches to make up circuit (ground I think) to confirm to the system that they are closed and cannot be struck by slide as it moves in or out. What I cannot understand is how the circuit can be complete with one of the switches missing as they are daisy chained together!! So if on is open anywhere in the sequence it will keep the slide from going in or out and damaging the door or slide.

chuckftboy · 11-20-2019, 09:25 PM

Since these switches are all in series any one could be eliminated as long as the circuit was complete through the rest of the switches to ground. Have you ever checked to see if they even prevent the slide from operating with a bay door open? Possibly at some point someone ran a separate ground to the slide controller because they removed a failed switch and never got around to replacing it. Are you the original owner?

bucks2 · 11-20-2019, 09:33 PM

Take an existing switch out and use your VoltOhmMeter to see if it's normally open or normally closed.

1Motorhome · 11-20-2019, 10:41 PM

Quote:

Originally Posted by chuckftboy

Since these switches are all in series any one could be eliminated as long as the circuit was complete through the rest of the switches to ground. Have you ever checked to see if they even prevent the slide from operating with a bay door open? Possibly at some point someone ran a separate ground to the slide controller because they removed a failed switch and never got around to replacing it. Are you the original owner?

No I am not the original owner. I am the second owner of this coach.
The switch that is missing is the last one in the sequence and the wire continues up into the coach through the floor. Actually it looks like it goes up about where the bed is and the slide motor is under the bed.

No I have not tried opening the door and moving the slide...but that is a great suggestion!!! As I said, the slides work with no problem with the missing switch which concerns me.
Thanks

1Motorhome · 11-20-2019, 10:42 PM

Quote:

Originally Posted by bucks2

Take an existing switch out and use your VoltOhmMeter to see if it's normally open or normally closed.

Ahha moment ..... Thanks

veraken · 11-21-2019, 06:44 AM

Don't know what your switch looks like, but this is what I used.

https://www.ebay.com/itm/4-Pack-Univ...72.m2749.l2649

1Motorhome · 11-21-2019, 08:47 AM

Quote:

Originally Posted by veraken

Don't know what your switch looks like, but this is what I used.

https://www.ebay.com/itm/4-Pack-Univ...72.m2749.l2649

Yep, That's it!!! Wow I wish I had found those, That's an excellent price for 4.
What kind of problem were you having brought you to replace them??

1Motorhome · 11-21-2019, 09:28 PM

OK, I opened the compartment door next to the one with the missing switch and the slide would not move. This leads me to believe that the limit switches are working as they are designed to, BUT... with the door closed the slides work without the missing switch in the bay next to the one I had opened.
I then opened the one with the missing switch and YES the slide worked!!
Very strange?!?!?
I will replace the switch as soon as the new ones arrive and check again to see if this makes a difference.

veraken · 11-22-2019, 06:13 AM

Quote:

Originally Posted by 1Motorhome

Yep, That's it!!! Wow I wish I had found those, That's an excellent price for 4.
What kind of problem were you having brought you to replace them??

Age. The one in my water compartment broke off at the 12v connection.

1Motorhome · 11-22-2019, 08:58 AM

Quote:

Originally Posted by veraken

Age. The one in my water compartment broke off at the 12v connection.

Ken, did those switches on your coach have anything to do with your slides, or were they for the bay lights?

Argosy · 11-23-2019, 06:00 AM

On mine those switches are for a dash light that operates through the ignition switch. Open a door and turn on the ignition and see if yours has a light.