We have a new light for the older motor homes. I'm not sure what all years Airstream put them on the Argosy MoHo and if they were also used on any Airstream s. They (AS) converted a marker light to serve as a turn signal light and a running light. Two wires come out of the MoHo and the mounting holes of the light serve as the ground. Of the two wires on the back of the LED upgrade light, one is turn and one the running light.
Unlike on the original light where half of the light is a turn light and the other half is the running, all the 13 LEDs light up, when the running lights are on and all 13 LEDs light up (brighter) when the turn light come on. :-)
NOTE: This light will have to be used in conjunction with the cast aluminum bracket that comes with the MoHo. This will make room for the components on the back of the light which do the magic.
The pictures below will help show what I'm talking about.
The part number is LED508Yturn
If you know what other units and years this design is used please chime in and tell us.