Glen Lewis
Member
What are people using to warn that the master switch is left on?
I have a warning light connected to a oil pressure switch for the hobbs. The pressure switch is wired with one + input and two outputs. One of the outputs is hot when there IS oil pressure which is connected to the hobbs. The other output is hot when there IS NOT oil prssure. The latter is connected to a oil pressure warning light. When you shut down and there is no oil pressure the light turns on and remains on until you shut off the master.
I have a warning light connected to a oil pressure switch for the hobbs. The pressure switch is wired with one + input and two outputs. One of the outputs is hot when there IS oil pressure which is connected to the hobbs. The other output is hot when there IS NOT oil prssure. The latter is connected to a oil pressure warning light. When you shut down and there is no oil pressure the light turns on and remains on until you shut off the master. I also have a GRT EIS that will turn it's warning light on when the engine shuts down and there is no oil pressure. I have the EIS switched so it is possible that I could shut off the EIS but not the master that is why I still need the seprate warning light.
The set-up I use with a pressure switch that powers Hour meter or warning light is actaully one suggested by VAN's.
"Hour meter (similar to Hobbs) activated by oil pressure switch, records engine time. System requires ordering both components (Meter and switch) separately. Optional oil pressure switch can be wired to run Hour Meter and illuminate a panel light if the oil pressure drops below 15 psi. Besides being a monitor should you loose oil pressure, this effectively works as a warning to turn the Master Switch off when the engine shuts down provided a large enough red light is mounted on the panel."
Oil pressure switch for activating Hour Meter and light
Part Number = IE SPDT PRES-15 SW
Price = $35.00