Replacing water heater - electrical issue

[sedavis63]

I am replacing my suburban 12 gallon water heater with a Girard tankless model. When I went to wire up the Girard, there is a black and red wire coming from the heater, but a black, red, and orange wire coming from the switches in the control panel in the rig. Does anyone know what the orange wire is for? I have hooked black to black and red to red, but the unit is not getting a full 12 volts.

Sent from my SM-G935V using Tapatalk

[FT4NOW]

I'd bet it's for gas or electric mode and red would be the other one, black would be ground (negative terminal).

Sent from my SM-G950U using Tapatalk

[Agpopp]

I would agree the orange is probably the relay trigger for 110v mod e

[sedavis63]

I'd bet it's for gas or electric mode and red would be the other one, black would be ground (negative terminal).

Sent from my SM-G950U using Tapatalk

Thank yoy

Sent from my SM-G935V using Tapatalk

[steve gravelle]

Please, please, please get professional assistance! Even though it sounds like it is 12 volts, could be dangerous and possible disaster. Life is too short.

[Dangerous Dan]

Please let me know how this turned out. I would like to do the same thing.

[livinthelife]

Please let me know how this turned out. I would like to do the same thing.

I'm going to guess, since the original poster last posted here 3 years ago, they aren't here to answer you.

[Dangerous Dan]

Safe assumption