PlayDate
Well-Known Member
You said you replaced the overspeed board. Where did you get it?
If you look at your schematic, you can see the water temp and exhaust temp are normally closed switches, the oil pressure switch is normally open when the engine is not cranking/running. The preheat switch bypasses the safetys electrical circuit but once released looks for a complete closed switch circuit with 12 volts. If 12 volts is not present, the coil and fuel pump are de-energized. With cranking/normal oil pressure ....all the safetys are in the closed position and 12 volts runs through them. So, when you test the temp and exhaust temp switches with an ohm meter with the engine off they should read closed so jumping them is unlikely to mean something unless they were stuck open. The oil pressure switch is more interesting because it is normally open on your generator. I believe you said you replaced it. Westerbeke makes two that look identical: one normally open and one normally closed.
An ohmeter should read the oil pressure switch open with the engine off. If by some strange chance, you put a closed one in as a replacement....that would explain the entire problem.
I will try to upload the schematic so that we can trace it together.
-John
If you look at your schematic, you can see the water temp and exhaust temp are normally closed switches, the oil pressure switch is normally open when the engine is not cranking/running. The preheat switch bypasses the safetys electrical circuit but once released looks for a complete closed switch circuit with 12 volts. If 12 volts is not present, the coil and fuel pump are de-energized. With cranking/normal oil pressure ....all the safetys are in the closed position and 12 volts runs through them. So, when you test the temp and exhaust temp switches with an ohm meter with the engine off they should read closed so jumping them is unlikely to mean something unless they were stuck open. The oil pressure switch is more interesting because it is normally open on your generator. I believe you said you replaced it. Westerbeke makes two that look identical: one normally open and one normally closed.
An ohmeter should read the oil pressure switch open with the engine off. If by some strange chance, you put a closed one in as a replacement....that would explain the entire problem.
I will try to upload the schematic so that we can trace it together.
-John