Ok , thanks to all that has looked at this, sorry for not having too much information on this board. This board was as I am told , stuck behind a panel box in the van, Also I have included a picture of the front of this board above. If I try to get too much definition the site will not allow more than 100 mb I believe. What I can tell you at this point:
The PVB part # is what I once thought it was but I was wrong,
There are 4 leads to this device,one side has a wide lead ,and it is manufactured at least it appears to be that way but is a single lead through the board, the other edge has 3 leads, center is clipped.
I am told that this board controls a fan, i suspect it has to do with going between 100v ac and 12vdc ,seeing how it will control the fan circuit.Again I am just guessing,will try to contact the person I was trying to help with this for more information.His van is at a camp site that he rarely goes to.
The single lead goes to what appears to me 137 ohm resistor which amazingly enough still read on 200 ohm scale my ohm meter.
I have tried to clean component but alas nothing left to see.
I will include another shot of this board backlit ,maybe you can get a clue this way.
Thanks to all