Wiring Instructions For A Dometic RV Water Heater Single-Panel Control Switch

Updated 05/20/2025 | Published 11/20/2021

Question:

Hooked the three wires up in back but I have none of the other wires hooked up old one didnt have but 3 wires

asked by: Johnathan H

Expert Reply:

Since you don't have the wiring harness on your previous RV water heater you most likely had an all propane powered unit. The Atwood RV Water Heater w/ Heat Exchange - Gas and Electric - Automatic Pilot - 8,800 Btu - 6 Gal #AT96163 is powered by both gas and electric and has a wall mounted control switch which is where the red, blue, white, and green wires on top of your water heater would run to. Since you don't already have the # AT91859 wall switch installed you would need to install it in your RV and run wires from it to the water heater. I've attached the wiring diagram for you below.

Depending on the distance of the switch to the water heater you could use the Replacement 4-Wire Control Harness for Atwood Water Heaters # AT93312 which will come with connectors to easily attach to the prongs of the # AT91859.

expert reply by: Kevin C

Wiring Diagram
(click to enlarge)

Lisa

5/16/2025

I've got brown wire coming from bottom back side rv water heater replacing cause got some bad breaks in the wiring but trying to figure where it's coming from and where it's gotta hook up at and have this component with 1234 on back of it with looks like 2 D batteries

Robin H.

5/20/2025

@Lisa what kind of water heater is it? What is the problem?

Lisa

5/16/2025

There is 2 switches one inside on wall and 1 inside the compartment with outside vent and thermostate and reset switches I'm not to familiar with this setup never lived in RV before