Originally Posted by Slimjc
It is clicking when the battery reaches full charge and there is no load on the battery. As soon as I apply enough load it stops.
Is it clicking once, or repeatedly? It could be the relay that charges your chassis battery and as soon as you apply a load it drops out the chassis battery because the coach needs the voltage for the house batteries. Even so, it should have a 15 second time constant that prevents what you are experiencing.
How is your chassis battery BTW? It could also be trying to charge the chassis and the chassis needs too much so it drops out again and then repeats the cycle. Again, the time constant should prevent this.