Water heater keeps blowing fuses!

[ezzywave]

Sorry to confuse everyone so much. Here is what is going on.

The wire from the fuse box to the water heater on/off switch is fine. The water heater on/off switch has 12v going to it, measured from the bottom terminal (on the back of the switch).

The middle terminal, on the back of the same switch, sends 12v to the water heater controller module when the switch is flipped to the on position.

First I disconnected water heater control module.

Then I disconnected the middle wire from the on/off switch, which carries 12v to the water heater controller module when the switch is flipped to the on position.

Using an ohm meter I connected one lead (of the ohm meter) to the wire, and the other to ground. Ohm meter showed zero ohms (resistance).

The wire that goes from the on/off switch to the controller is shorted to ground somewhere.

So I temporarily supplied 12v (fused) with 20 feet of wire to the water heater controller.

And...

It works exactly like it should!!!

Next I will have to remove all the covers under the trailer to try to find the short. Or run a new wire to the controller. Or wait until July 10 to bring it to the dealer and let them deal with it.

Thank you all for taking the time to help me out!

[5picker]

Originally Posted by ezzywave

Sorry to confuse everyone so much. Here is what is going on.

The wire from the fuse box to the water heater on/off switch is fine. The water heater on/off switch has 12v going to it, measured from the bottom terminal (on the back of the switch).

The middle terminal, on the back of the same switch, sends 12v to the water heater controller module when the switch is flipped to the on position.

First I disconnected water heater control module.

Then I disconnected the middle wire from the on/off switch, which carries 12v to the water heater controller module when the switch is flipped to the on position.

Using an ohm meter I connected one lead (of the ohm meter) to the wire, and the other to ground. Ohm meter showed zero ohms (resistance).

The wire that goes from the on/off switch to the controller is shorted to ground somewhere.

So I temporarily supplied 12v (fused) with 20 feet of wire to the water heater controller.

And...

It works exactly like it should!!!

Next I will have to remove all the covers under the trailer to try to find the short. Or run a new wire to the controller. Or wait until July 10 to bring it to the dealer and let them deal with it.

Thank you all for taking the time to help me out!

Thanks for keeping us posted and clearing up my confusion!
You've got some sleuthing to do but I have no doubt you'll find it and be back up and running before long!
Good job!