Simple test is if your glow plugs are working, you will see a big spike on the voltmeter when depressing the switch. The voltage should be the same at the plugs as it is at the switch, if not, check the circuit.
Another thing to check is the older Westerbekes used a trailer type connector to connect the panel to the engine
. The contacts are subject to corrosion
, and should at the least disconnect and squirt WD40 once or twice a season.
When you depress the glow plug
switch, you will hear a click, that is the solenoid that opens the fuel delivery
. Have someone hit the switch while you are making sure it depresses fully.
The electric lift
pump is also subject to issues. Check and clean the filter. A weak lift
pump is not good for the injection pump as it is not made to pull in fuel.
I have seen the generator
run off a T fitting from the tank and fuel essentially sucked back.
We have a secondary switch that controls the electric
lift pump, so able to turn it on for a few minutes before the warming the glow plugs and found this solved
a lot of problems, especially after changing a filter to allow it to auto bleed without cycling the glow plugs.
Turn off the seacock that feeds the generator
until it starts. This will wear impellors fast, but save your engine from water
backing up into the cylinders. I prefer to remove the hose from the mixer and allow it to drain into the bilge
until the first start.