I have been having a devil of a time with a circuit breaker tripping on my Westerbeke
55B4. The engine
will crank and run quite easily, runs for about 5 minutes, then shuts down. The circuit breaker in the engine wiring
has tripped. I re-set it, and in a second attempt to start the breaker trips as soon as the key is engaged. If I let everything rest (cool?) for say 6 hours or so, it may start, run 5 min., then shut down. Same old drill. Or it may trip the breaker upon switching.
I have disconnected everything that runs from the main engine wiring
temp sender, water
pressure sender, oil
, fuel pump
, connections to the alternator
, pre-heat, alarm buzzer, starter motor
solenoid- all but the fuel
shut-off solenoid. Still the breaker trips.
When I disconnected the starter solenoid, the circuit breaker behaved itself and acted normally. Thinking that pointed to the starter motor
, I removed the starter (no small task, as you may imagine) and took it to two automotive starter shops. Shop #1 sez "yeah the motor is shorted but I don't know where to get parts
for a Westerbeke
." Shop #2 sez "nothing wrong with this but I'll clean it up for you." So he does, and changes the solenoid anyway.
Upon re-installation, same old story.
I have gone through the wiring harness as carefully as possible under the cramped and inaccessible conditions and found one spot that appeared to be rubbing with the block. Taped it, and put a piece of wire split loom over it. No difference. All I am left with is the fuel
shut-off solenoid. (Incidentally, there is split loom the full length of the harness, and is unprotected only when it comes out of the harness to the appropriate terminal.)
I know I can take the fuel solenoid out of the circuit, and that the engine will run until the fuel in the injectors is combusted. The problem is that if nothing was wrong with it before, considering its inaccessibility and cramped conditions, the process of disconnecting it may create new problems. Kinda the "if it ain't broke,......" situation.
I have not checked the instruments, thinking "no way."
So thus two questions: is there any way to test that fuel solenoid while in the circuit?
And if there is, and it checks out, how do I get this @?&@!!! Westerbeke to run- and keep running without tripping?
For the insatiably curious, the wiring diagram in question is available on the Westerbeke website in a download of the 55B4 Operator's Manual.