Thule electric step probems help required

[Portland]

The step on my Autotrail Savannah is very eratic when working, sometimes not working at all other times stopping at random. It goes down first time of a morning. But never fully retracts.
The step action is totally free, the motor is new. Motor replaced due to sheared gears, tried Sargents many times but have no reply

 

[icantremember]

We had a similar problem on a Autocruise Augusta which was caused by a fault in the Sargent unit .. it was replaced under warranty and all was then well.

 

[autorouter]

Another possibility is the switch. Is it a separate switch or is it in the Sargent unit?

 

[Portland]

Another possibility is the switch. Is it a separate switch or is it in the Sargent unit?

It's the Sargent unit

 

[Polar bear]

Had same problem on my savannah it was a small drive shaft for operating step took dealer 15 minutes to replace apparently a common fault.

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[Jaws]

The step on my Autotrail Savannah is very eratic when working, sometimes not working at all other times stopping at random. It goes down first time of a morning. But never fully retracts.
The step action is totally free, the motor is new. Motor replaced due to sheared gears, tried Sargents many times but have no reply

It will be the Sargent EB50 box .. Pretty common .
I spent weeks trying to sort mine out.. I even removed every component from the board, replaced all the TTL chips, the diodes, and transistors.
In the end I gave up and sent it to Sargent.
Got one back ( a replacement ) almost by return with a hand written note saying they could not find the fault either !

Some time later I received an email..
The fault was an intermittent break in one of the connecting tunnels between the board layers.. Made me feel a bit better about not finding the problem myself