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Old 11-14-2019, 11:43 PM   #1
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Electric Water Heater Switch Connections

I ordered a new switch.
Before I could change it out, my wife disconnected the old switch. Each has 3 prongs, but I have no clue as to which wire goes to which prong. Nothing is labeled. How are you to know which wire goes where? And, why are there 3 wires, instead of 2? Possiby a ground wire? There is no wiring diagram in the packaging.
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Old 11-14-2019, 11:46 PM   #2
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Water Heater Switch Click image for larger version

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Old 11-14-2019, 11:50 PM   #3
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The third wire is for the light inside the switch.
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Old 11-15-2019, 12:09 AM   #4
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I agree it is for the light in the switch that would go to ground . However the light would be voltage rated probably 12 volt?
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Old 11-15-2019, 12:32 AM   #5
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Quote:
Originally Posted by Unplanned View Post
The third wire is for the light inside the switch.
Correct. The switch has three legs

1. A hot (easily checked with a meter, will read 12 volts constant),

2. a ground that grounds one leg of the indicator light inside the switch so that it lights when supplied by turning the switch on (also easily checked with a meter, continuity to ground, in 90% of motorhomes this will be a white wire), and

3. the load which will also likely show some continuity to ground, but is likely to have some impedance.
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Old 11-15-2019, 10:41 AM   #6
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One of the 3 wires that connect to the electric water heater on/off switch is a hard ground wire. Another of the 3 wires is fused 12 volts. The last of the 3 wires connects to the hot water heater.
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Old 11-15-2019, 10:52 AM   #7
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Here is a more complete answer ...

The top switch terminal, is the wire that has the hard ground (JP)

The middle switch terminal, is the wire that goes to the hot water heater (HHJ)

The bottom switch terminal, is the wire that has fused 12 volts on it. (JA)


On my particular Winnebago wires have the letter codes printed on them and wires that are ground wires are white and other wires are yellow.

Hope this helps.
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Old 11-15-2019, 11:13 AM   #8
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Quote:
Originally Posted by powercat_ras View Post
Here is a more complete answer ...

The top switch terminal, is the wire that has the hard ground (JP)

The middle switch terminal, is the wire that goes to the hot water heater (HHJ)

The bottom switch terminal, is the wire that has fused 12 volts on it. (JA)


On my particular Winnebago wires have the letter codes printed on them and wires that are ground wires are white and other wires are yellow.

Hope this helps.

One added note--------


The GOLD terminal is for the FUSED 12VDC (JA)
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