Mystery Cable in 2006 Tourmaster

[djqualls]

I have a mystery 110 vac cable handing down in the compartment that housed the shore power cord and convertor/charger.

There is a single outlet plug wired within reach of the cable as well however I just noticed it tonight and went Hmmm....

I'm assuming that it maybe some cold weather related heater cord since there is a breaker labeled I think "Tank Heater"

Now For the Question...............

Does anyone know what it might be and how can I test to qualify what it is?

Thanks

Dave........