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Hi, I'm Robert. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply momentarily.
IF the steps only work when you are plugged into AC power or running the generator check your battery voltages, you could have a weak battery. When you are plugged into power the power converter will take the AC voltage and charge the battery, when you unplug you are only running off of battery power. So I would go to the batteries and check both the house and chassis battery and make sure you have over 12 volts, if the voltage goes below 11 volts the step may not want to work. I am not aware of any relay that would only allow the steps to work when you have AC power as the steps operate on DC power so I would be checking the batteries and cables to start off on this and then go from there.
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I would still get a meter and check both the house and chassis batteries, not sure if the step is wired to the house or starting battery. IF the voltage is under 11 volts then it would be an issue, should be a simple check to eliminate a low voltage issue for the step. When you are plugged in you should be getting max DC voltage via the converter. Step might be tied to the starting battery if all the house items worked when you were unplugged.
OK if you extend the step and then start the ignition will they run in???? They should have an ignition override, meaning if they are out and you start the the ignition they should automatically run in......
Do you have a step switch and have you tried both positions with the step out when you start the ignition?
DO you know the manufacture of the step??
Do you happen to have the make and model of the step???
This one is a head scratcher....
Let me check....
So that is there "platinum" series step, click HERE to have a look that should be yours, normally the circuit will have two fuses, one for the ignition over-ride and one for the main power hook up, you can check for voltage on the yellow wire with the ignition switch on, if that wire has no power then I suspect you have a blow fuse, if that wire does have power then I suspect the control box for the step is faulty, check all the wiring under the step, make sure the main ground is clean and tight. I tend to think the problem might be in the control box for the step. The step should run in when you turn the ignition switch ON.... IF that is not happening the signal is lost or that control box is bad.
Hope this helps some.
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Right you have 2 sources for the step, the ignition for the ignition over-ride and the main power source from house battery. It sounds like the ignition side is the problem as the step should be running in when you turn the ignition key ON and the step is out, I think that is the key here. I would look at the info I sent and see if the yellow wire has voltage before and after turning the ignition switch on.... The problem could be a blown fuse on that circuit or the control box for the step....
That sounds like the control box and it could be the issue here. In the manual I sent it shows it on page 3.....Picture to the right,
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