Jim,
I'll hazard a guess that you're looking at the brake hookup wires. One
of those wires is probably 'hot' from the battery. The 'relay' is
probably a circuit breaker. The three wires would be:
to the brake magnets
from the tow vehicle connector
from the breakaway switch
This might also be the charging circuit. In that case, one wire is from
the tow vehicle connector, one goes to the battery, and the other
probably goes to the breakaway switch.
<<Jim>>
> Jim Ammen wrote:
>
> Hello Airstream Aficionados,
>
> While repairing the underbody of our 30' 1966 Sovereign AS I came
> across a riveted in metal door (~5"x 7") with what appears to be an
> electrical relay. A light blue wire comes into it and I assume it is
> the charge. Then two thicker wires come out of it - one red and one
> dark blue with no reference in the wiring diagrams as to the latter
> wires. Any idea what this is for? It is deteriorating, should I
> replace it?
>
> Thanks,
>
> Jim Ammen
>
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