Steps

Doug you said the brown wire is ground tomorrow I will check that and use that for my ground
I am old and don’t move like I used to it hurts to get up and down!

Not sure of exact fuse numbers! I would go through all the fuses checking both sides.
The control fuse should be off the chassis battery and the motor power is off the house battery power.
Do you have the exact make and model number of the step?

sssooo wrote:
Would that be f22 or f 13?

You are getting hung up on that linked Schematic. You stated you replaced the fuses. Did you LOOK and check if they were bad? There is a 12 to 14 gauge GREEN wire that GROUNDS the step to the chassis frame. Have you checked THAT for secure connection and ground. What I do and have ALWAYS done, is, I use a 12 volt test light and check EVERY fuse I can find for the chassis with the Key ON. You can do this in less than 10 minutes no matter what Brand or Model Motorhome. From your description I will bet you do NOT have the test light on a GOOD ground for the alligator clip when testing the Step 4 wire plug. Doug

Would that be f22 or f 13?

Have you verified the two ground connections at the step?
Did you locate the fuses at or near the battery control center?

Test lite
Are the fuses on that board?

sssooo wrote:
I replaced the 2fuses but still have no power it the plug under the mo would a bad motor cause it to have no power I am at a lose?
Scott

How are you checking for Power? Test light or Multimeter?
RED should have 12 volts
Yellow 12 volts when engine running
White 12 volts when switch is on
Brown is a ground from door magnetic switch

Motor CANNOT cause a Power problem.
Last, the Odds of losing 12 volts on all 3 (Red/yellow/White) at the same time is statically extreme. They each have their own fuse supply(3 fuses). Doug

I replaced the 2fuses but still have no power it the plug under the mo would a bad motor cause it to have no power I am at a lose?
Scott

sssooo wrote:
I checked the plug underneath the MH and got no power so no lite!

When you find the 20 amp fuse. Install a Auto Reset 20 amp 12 volt circuit breaker. Then you do not have to worry about a fuse blowing, unless you have a direct short, which will cause the CB to not reset. Doug

This post was very helpful for me.

On a trip to Florida my stairs became erratic, opening and closing as we drove. I pulled the plug and wire tied the stairs up. I replaced the motor once I got to my destination. We stayed for 6 weeks assuming everything was cool, it wasn’t. As we rolled down the road the same thing happened. I pulled the plug and wire tied the stairs again, the motor was hot.
Someone pointed out that it maybe the magnetic sensor.

My apologies for not adding your quote to this post.