The power to the starter button is supposed to come off the switched
terminal of the glow plug button. You are supposed to to have to push
the glow plug switch and the starter switch every time you start, as the
glow plug switch also powers both the electric fuel pump until the oil
pressure builds up, and silences the low oil pressure alarm. Once the
oil pressure rises, its switch powers the fuel pump.
I put an M30B in our club launch and it has the same setup.
Neil Gallagher
Weatherly, 35-1
Glen Cove, NY
On 8/10/2015 11:15 PM, David Knecht via CnC-List wrote:
Since I got my boat, I have been bothered by the fact that the engine
will not start in the way it is described in the manual unless plugged
into shore power. The manual says to hold the glow plug button for
about 30 seconds and then while continuing to hold that button in,
push the start button. When I do that, the starter does not turn
over. If I release the glow plug button and push the start button the
engine starts fine. My father (retired electrical engineer) and I
(genetic engineer- useless in this case but sounds good) spent some
time trying to diagnose the problem this weekend and found two
interesting things:
1. The buttons both tested fine in terms of their switch function.
We then tested power at the engine. There is a heavy red cable
coming from the battery to the starter measured 12V. The red-yellow
wire from the start button is attached to what I am presuming is the
solenoid (the wiring diagram in the manual does not show a solenoid).
We only measured 8 volts at the solenoid when the button is pushed,
but 12 volts everywhere else. So that probably explains the fact that
both the glow plugs and starter won't work at the same time because we
appear to be losing 4 volts in the solenoid. I will pull the starter
next winter and have someone test it unless someone has an alternative
suggestion.
2. The wiring diagram in the manual (Fig 2 on page 13) shows the
power from the key switch coming into the glow plug button and then a
wire from the other lead to the start button. The manual shows that
wire running from the downstream side of the glow plug switch so that
the start button should only be energized when the glow plug button is
pushed (as the manual describes). If that were the case, the I would
not be able to start the engine with only the start button.
Nevertheless, it does start the engine. Tracing the wires, we found
that the bridging wire actually came from the hot side of the glow
plug switch, so that either button will work independently as both are
always powered. What I don't understand is why you would wire it the
other way (as the manual shows) since that would remove the ability to
start the engine without the glow plugs (as in an already warm
engine). I don't know if the PO or some yard mechanic made that
change or if it is indicated wrong in the manual, so I am curious how
other Universal panels are wired. The way it is actually wired makes
more sense to me than what is in the manual unless I am missing something.
Thanks- Dave
Aries
1990 C&C 34+
New London, CT
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