2000 Hotsprings Sovereign Will not heat
I'm copying the OP's comment which described the resolution as an answer:

I looked at everything and saw one of the jumpers on the relay box
that feeds the heater wire was a little loose and had some burnt
plastic on the wire connector so I made a new jumper with new
connectors with proper gauge wire and VIOLA the heater is working.
Unbelievable that's all it was hopefully. It was hidden and hard see
with it being so close to the other jumpers. I did order new
thermistors because they are cheap and have never been replaced since
new in 2000.
Donnie Sharpless Sep 14 '17 at 22:19