This is also known as the coolant level sensor? The big square 42 or 43 ?
Sorry for my lack of knowledge 

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  On Sun, Aug 12, 2018 at 6:31 PM, David Beierl<dbeierl@attglobal.net> wrote:   
The controller triggers when it's an open circuit between the sender lead and ground.**   

Oops, forgot my asterisks there.

**Connection to any constant voltage between battery voltage and ground with about 150kΩ or less resistance will keep the controller in the quiescent state.

Yrs,d