What does this male plug do

[mark2line]

I own a 2008 Tour Master T40A. There is a wire in the back corner of the power cord compartment hanging with a male 20amp plug on the end of it. There is also an electrical outlet on the back wall that the wire could be pluged into. I tried to trace the wire and it seems that it goes to the side of the Mercedes 330 diesel. Is this a block heater. I never seen it before.
Everything in the coach works so that is the only thing I can think of.

Mark2line

[Jim Stewart]

Most likely and engine block heater. You can test it by plugging a light into the outlet, turn the light on and then go inside and turn off the breaker marked engine block heater in your main interior power panel. If that controls the light, that was it.

[wa8yxm]

Is this a block heater?: Is there a circuit breaker labeled with something that might translate to "Block Heater" (example Blk Htr)? If so then: YES

[mark2line]

Thank You

I will check to see if there is a breaker with that label and try the recomended light.

Mark2line