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Old 10-26-2015, 07:18 PM   #1
Join Date: Nov 2011
Location: Layton, Utah
Posts: 69
Slideout intermittent ** check your ground

I have a 2003 Montana 5th wheel with 2 slide outs . On several occasions the slide outs wouldn't move when the switch was pushed. Once I had the wife push the button after I had attempted 3 times. This time I stayed in the front bay where the hydraulic motor was and listened. The relay on the hydro motor would click but the pump did not come on. I tapped on the relay solenoid and it would work. So I ordered a new solenoid and everything worked great after replacement. Then it started again. The in out switch did nothing. I went back to the pump and had the wife hit the switch again I tapped on the pump lightly with a wrench and it just so happened that one end of the wrench was hitting the trailer frame while the other end of the wrench was touching the case of the pump sparks flew and the pump began to pump. I didn't bore you with the hours of troubleshooting wire connections, contacts, switches, checking for level etc. All along my problem was a ground. The solenoid is mounted on the pump motor, the pump motor is mounted on a small platform and the small platform is mounted on a holding tray that would retain any spilled hydro fluid. Well the holding tray and platform were connected by 2 bolts on one side and just the weight of the platform on the other side. Both items were painted very well to help with corrosion and because they were painted while separated, the bolt holes were coated with paint as well. The tray was welded to the frame so no issues with the ground there. The rack mounted to the trey with the two bolts did not get a good ground consistently and therefore caused intermittent issues. To resolve the problem I removed some of the paint in the mounting holes and changed the bolts to stove bolts that have square shanks just before the head. Drilling the holes a little larger and pulling the square shank through the tray hole with pressure from the nut being tightened forced the sharp corners of the bolt to grip tight against the hole. After that bolt was really tight I attached a #4 cable from the neg on the battery to the bolt and attached a second nut to hold it tight to the frame. It has been working great ever since.

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Old 10-31-2015, 08:10 PM   #2
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Join Date: Aug 2001
Location: North America somewhere
Posts: 12,300
The most common cause of 12V problems are the result of poor or broken ground, something like 90% is the figure.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"
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slide, slideout

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