Forum Discussion

Scott_M's avatar
Scott_M
Explorer
Sep 19, 2020

Odd Electric Step Problem

Our step has been working fine for a couple of years. Today, I was giving the RV a bath and went to back it into the carport and I heard the steps go out. I turned the RV off and the steps go in.

Even with the step over ride switch off, the steps extend when the you turn the ignition key to the start position.

With the ignition off and the step switch on the steps work fine. Extend when the door opens, retract when the door closes. Turn the step switch off while extended, they stay extended.

Any thoughts? It doesn't appear to be the motor. Maybe the controller module? Ignition interlock?
Class C
  • enblethen's avatar
    enblethen
    Nomad
    Sep 19, 2020
    There is two grounds in Kwikee steps. One for the control and one for the motor. Suggest checking both.
    Make sure the two fuses are good. One is from chassis battery, one from coach battery.
    Chassis battery power runs motor, chassis battery is control.
    Make and model of step?
  • Scott_M's avatar
    Scott_M
    Explorer
    Sep 19, 2020
    I have looked for fuses and can not find any that are designated for the step. What size fuse am I looking for? It should be a chassis fuse and not a coach fuse correct? It's on a Mercedes Sprinter chassis. Looked at fuse panel on chassis, there are about 30 fuses, no index on cover. Since this was equipment installed at Thor conversion factory, I doubt the Mercedes manual for label the step operator.

    Battery under floor and have not opened it up yet.

    Grounds are both good and clean, no rust or corrosion. Cleaned both ground terminals.
  • enblethen's avatar
    enblethen
    Nomad
    Sep 19, 2020
    Make and model of step?
    Kwikee steps have two.
    One from chassis battery, 30 amp
    One from coach battery, 5-7.5 amp
    I have seen a Sprinter chassis that has fuse block under the passenger seat. Almost need to pull seat!
  • enblethen's avatar
    enblethen
    Nomad
    Sep 19, 2020
    This portion is operating properly:
    With the ignition off and the step switch on the steps work fine. Extend when the door opens, retract when the door closes. Turn the step switch off while extended, they stay extended.

    Another item to check is the magnetic door switch. Make sure it is place and is aligned with the steel plate on door.
  • Scott_M's avatar
    Scott_M
    Explorer
    Sep 19, 2020
    P/N on step controller box:

    PN: 1800709 REV 0F.

    Sticker on other end of step assembly:

    DOM:02/21/2018
    RPO-0001205843
    2 ELE 25.50 11.13 13.64 STR ACT ST BLK
    908032000

    427108
  • ksg5000's avatar
    ksg5000
    Explorer
    Sep 19, 2020
    Since the problem started after washing the rig maybe it will resolve itself when wiring etc dries out?
  • richy2's avatar
    richy2
    Explorer
    Oct 03, 2020
    ksg5000 wrote:
    Since the problem started after washing the rig maybe it will resolve itself when wiring etc dries out?

    I had the same problem while driving through a heavy rain storm. I noticed the step going in and out while driving down the road. Issue stopped after it dried out. I wrapped the control module and wiring in plastic and sprayed waterproofing over it. No problem since.

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