Modify outside air step wiring to allow step to retract when ignition is off
I also have
modified outside step wiring to allow step to retract when ignition
is off. I did it for security reasons and have used it several
times. It prevents someone from stepping up to look in door window.
And makes a parked Motorhome less inviting and secures the small
storage behind the outside step when folded up. And in a confined
parking situation, makes step less vulnerable to physical damage.
One may also want
to install a 'kill' switch to prevent a quick engine start if
ignition is jumpered. One could prevent battery current from
reaching ignition switch via a 'kill' switch if a more secure
situation warrants it.
The 3-way step air
control valve on our 1997 U270 is powered when ignition is on. This
12 volt ignition power feeds through the magnetic door switch to
retract step. With ignition on, if screen door or main door is
opened, the magnetic door switch is opened, air valve de-energized
and step will lower. When the 3-way air valve does not receive 12
volts, it feeds air pressure to air cylinder to force outside step
open. When the 3-way air valve receives 12 volts, it feeds air
pressure to the other side of air cylinder to force outside step
closed. When ignition is off, the air valve is de-energized and step
stays open, no matter what position magnetic door switch is in.
To retract step
when ignition is off, supply 12 volts to magnet door switch to
simulate that ignition is on. When screen or door is opened, magnet
door switch will open to lower step so we don't fall on our face
when leaving coach. Step will NOT change from open to close and back
to open, etc. if front brake air tank is depleted.
In this situation, step can easily be physically moved to closed or open position and will stay in the position.
HOW TO MODIFY WIRING
To modify outside
step circuit, I found wire 'C11' leading to magnetic door switch. I
mounted an inexpensive single pole double throw switch.
Switch does not have a center-off position. I cut wire 'C11".
I connected cut
wire that goes to magnetic door switch to center pole of switch. I
connected other side of cut 'C11' to one of the side poles of
switch. I then connected a house battery hot wire to other side of
switch. This circuit modification will not interfere with normal
coach operation. It will be another small constant draw on the house
battery when ignition is off and switch is in
Hope this help to explain how outside step works on our coach and is
an aid for you to design a modification that works for your coach.