isol relay melting

[climberbob]

We have a Thor 2016 31s Hurricane. We are on the road 10 hours from home in Nashville.
Where the house batteries are the isol relay melted. The relay is a intellitec potted B.I.R.D.gas 00-00956-000.
It started to melt when we were plugged into 110.
I shut off the 2 circuit breakers by the batteries. I'm plugged in to 110 and with my meter checking the batteries and voltage is 14.8 which is in charging range. When I unplugged the 110 line the voltage went down to 13.4 still in charging range. With the relay out
can I over charge the batteries?   
Where can I find that part fast?
What would be a replacement part for this?
Has anybody had there relay melt?
What could cause this?

 

[Gary RV_Wizard]

Several places online are advertising it, but whether they have stock is anybody's guess. Just have to check around.

https://www.google.com/search?client=firefox-b-1-d&q=bi+directional+00-00956-000


I wouldn't replace it until I had some clue as to why it melted.  Guesswork suggests the amp load was too high, which suggests a shorted battery in one of the banks, or an actual shorted wire somewhere.