Tom,
My coach is older than yours, but I don't think I have the dash light Larry is talking about. On my filter there is only one wire going to it. I think that wire, and especially considering its #14 or so gauge, is for the fluid heaters. I assume these heaters heat the fuel when called upon during low temperature conditions. It looks like I have two heaters in the filter.
The manual does show an option for a water detection switch to be mounted in the bottom of the housing that can be wired to a warning light. The probes on the switch stick up a way into the fuel/water and would give a warning when the water rose to that level. I check all the lights on my dash and I do not have any light with a label that seems appropriate for that function.
I suspect Larry has the sensor and dash light.
Russ
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