1995 Sovereign not heating beyond 90 degrees

[hopeful]

Hi,just got a 1995 sovereign.  Seems to be in good condition but cannot get it hotter than 90 degrees.  There is wire that isnt plugged to anything.  I think it was sitting drained and unused, but dont have much info about it. Jets and clean cycle run just fine. Any suggestions?

[Chas]

That tub will do 90 on just the circ pump. I suspect the heater relay board.