Is this a detachable cord? (they have a marinco outlet on the end that plugs into a matching inlet on the motor home?
IF so look at the end.. (Or look into the inlet)
3 curved slots (blades) one with a "notch" like device (KEY) and a metal spot on the side of the outlet. matching a ball like projection on the collar of the inlet?
That is a 50 amp hookup.
They sell 30 amp cords that fit it though.. I have one.. Use it on 30 amp sites.
I will link to the outlet or inlet
If you have this type of hookup.. .. Well The link
Example of amp inlet showing connections
http://www.campingworld.com/shopping...mart-led/69571
And the cord (50 amp that goes into it)
http://www.campingworld.com/shopping...rdset-50/72115
And they also have a 30 amp cord that fits it...but you know that already.