Fuse location for step controller and motor

[45Kevin]

Checked all the other threads about "fuse location" suggested by the site. Nada.

I've seen videos that show it inline right at the step, in another fuse box that doesn't look chassis factory.

My steps have no fuse near them
I know the step is controlled by the chassis, so was not surprised I did see it in the fuse/breaker panel.

There are three hacked in fuses under the driver seat, 2x15A and a 5A. Not big enough from what I've read.

It's a MB chassis and there is a fuse panel on the side of the driver's, there are several 25A fuses in there but they all checked out?

I guess I'm going to have trace the power wires coming from the step.

It's never easy with thing.

 

[45Kevin]

Checked on the MyThor website and all it provides is a generic manual that refers to "the fuse box".

 

[PS89]

Ya reckon it might help if you COMPLETELY identified your coach? Year, model, floorplan.

 

[16ACE27]

I guess I'm going to have trace the power wires coming from the step.

Or measure voltage at said wires IAW the steps' manual. If you got voltage, it ain't a fuse.

 

[ducksface]

Since you can't find a fuse;
To keep progress moving forward check the step to see if it has power there.

Once you identify your rv someone will be along about the fuse...but the fuse might not be the problem.

GENERALLY
if a fuse blows...it wasn't a fuse problem, It was a fusable problem.
Zomething that is not a fuse, causes a fuse to blow.

 

[45Kevin]

Ya reckon it might help if you COMPLETELY identified your coach? Year, model, floorplan.

Fixed. I'm sure I had it my sig on the old website. Maybe it didn't transfer across.
I'm usually a stickler for that too.

Since you can't find a fuse;
To keep progress moving forward check the step to see if it has power there.

Once you identify your rv someone will be along about the fuse...but the fuse might not be the problem.

GENERALLY
if a fuse blows...it wasn't a fuse problem, It was a fusable problem.
Zomething that is not a fuse, causes a fuse to blow.

Back story: The steps need to manually lifted and dropped for a few months.
The motor just made the grinding sound until I lifted or dropped them.
So I thought transmission gear set of motor gear set.
I replaced the motor today. Videos on You-tube said the motor was self adjusting.

When I turned the new motor on it just stuttered for a while.

And then did nothing.

Sick as dog so not in a rush to go scooting around under the RV at the moment, and maybe snow tomorrow or the next day. Sucks.

 

[ducksface]

Snowing here in Arizona today.
So,
Of the 40 things I had planned to do today...
The three I'd have actually tried didn't get narrowed down to the usual one I wouldn't have finished.

 

[16ACE27]

Fixed. I'm sure I had it my sig on the old website. Maybe it didn't transfer across.

Correctamundo. Sigs did not transfer.

 

[45Kevin]

Feeling better and the weather is warmer.

I checked power to the step at the 4 way connector and had 12V.
So I removed the new motor, lifted the steps half way and reinstalled the motor.

Works like a charm.

I still haven't located the fuse, but that was not the problem so maybe manana.

 

[Beau388]

If you plan on repair to your coach, email Thor MC CS and for the Bussmann Fuse Box electrical schematics.(assuming you have plant 750 or 850 gas class A coach). The wiring, fuse and interlock for the steps are shown.

 

[45Kevin]

Autopsy.

I bought a transmission and motor set for the steps off Amazon for less than $100.
I wasn't sure which part needed replacing so I got both.

The visible gearing is robust and metal.
The gearing the existing motor and transmission is identical.

I took the old motor apart and found that the gear in it was plastic, and the metal worm gear wore out the plastic.

I don't know why they used plastic on that ring gear. Maybe as a fuse?

Since the ring gear doesn't make a full rotation to lift or lower the stairs I suppose in a pinch you could just rotate the gear 180 deg and use the good side of the gear.

 

[Beau388]

You could have bought the motor with a mated plastic gear for less than $13. Hindsight is always better than planning ahead.