I have a 20018 Montana Mountaineer. When I took a trip recently the slide outs halt for a few seconds and then continue, this will happen a few times until all slides are in/out. It never starts/stops at the same place and it happens on all three slides.I don't see lights Dim or anything else that make it seem as if there is. I also checked the ATF fluid and topped it off to be sure. But the problem still exists.Anyone have any idea on what can cause this?

Check the 12 volt wiring at the HYd pump motor and make sure the cables are tight. Check the wiring from the Pump motor to its source both neg and Pos. Also, have someone operated the slides and take a 12 volt measurement AT the hyd motor and see if the voltage drops below 12 volts when running. Some Hyd and electric slides use a auto reset 12 volt breaker. If bad or loose connection they will trip and reset within a few seconds. If this has happened since new, they may have installed the wrong size breaker for the slide system. Doug

I did check the voltage, it is about 13.5v without running and runs just over 12v when the pump runs.When the slides stop the voltage drops to 0v and then comes right back up and the slides start moving again.Any recommendations on what I can try next to isolate this problem?

Locate the DC Circuit Breaker on POS wire coming from battery that goes to slidesIt will be close to battery. It is an auto reset....trips/resetsBad connections (2 studs.power in/power out)Undersized.

Don't see anything that looks like a breaker/fuse between the battery and the pump. The positive cable runs to some studs before going to the battery, but this is where other wires are split off from as well (landing gear etc). The wires are just bolted together. The negative wire goes up into the trailer.Within the trailer there is an automotive 20A fuse (not self resetting) listed as Slide, although this is likely for the outlets/lights but this fuse is fine.

Look on the negative side,.....it may run thru safety switches before going to the pump.But maybe not on a trailer.

Room slide out stops and starts | Good Sam Community

dbischops
Explorer
Jul 12, 2018
I pulled both breakers (they were inline) they seem to both be 12v 50A breakers. One of them is marked with (12V P43 50A) and the other one with (Shortstop 12V M48 50A).

Do I need to worry about the "P43", "M48" and "Shortstop" designations?
IB853347201
Nomad
Jul 12, 2018
Sounds like a low voltage issue to me. Questions: Do you have your engine running when you operate your slides? How old are your coach batteries? In most coaches, having your engine running is a must when operating slides.
Carl_n_Susan
Nomad II
Jul 12, 2018
The breakers are paralleled not in series. The one you want to replace is the one where the output wire runs directly to the pump. I have no idea what all the gibberish means, all we ever do is get a 40 or 50 or 80 amp breaker and replace it.
IB853347201
Nomad
Jul 13, 2018
IB853347201 wrote:
Sounds like a low voltage issue to me. Questions: Do you have your engine running when you operate your slides? How old are your coach batteries? In most coaches, having your engine running is a must when operating slides.
Sorry, i misread this post. Being a trailer i would have to say that your issue is low voltage. How old is your battery? Based on your test result would say that it has a least one bad cell, maybe more. replace the battery and you should be fine.
dbischops
Explorer
Jul 15, 2018
Just FYI, the battery was new.

Replacing the breakers did resolve my problem and the slides operate smoothly again.

Thanks everyone for helping me resolve this and especially for the picture of the breakers as I would never have recognized that!.

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Room slide out stops and starts

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