PS: Just thought of an easier way to check that pressure switch warning. ‘
Remove the lead from the pressure switch
Turn the key “on” m but don’t start the engine, and let the gage cycle through its test procedure.
Now, with the key on and engine not running, touch the lead to a good engine ground. The no oil light should come on (no alarm) until you remove the lead from ground. Might be easier to do this with an assistant after the sun has set so you/he can see the light clearly…. If this works out normally, then it is safe to assume the warning is activated by grounding the pressure switch/lead.
Now, you could take an ohm meter on the high scale and connect one end of the lead to ground the other end to the pressure switch terminal, the meter should show infinity. This test can be done on the trailer or at the dock.
If you wanted to test it running:
Get the engine warmed up, in the water on on a flushette is OK, then shut it off.
Now disconnect the pressure switch lead and restart the engine.
With the engine running, touch the sensor lead to ground. The horn should come on for about thirty seconds, then turn off, the light will stay for at least thirty seconds also, and for as long as the sensor lead is grounded after that. .
