my M4-30 will only start if the glow plug button and start button are pressed simutaneously so after about 20-30 seconds on the glow plug I then press the starter but while holding the glow plug button pressed and bingo, away she goes...the engine starts hard if I don't depress the glow plug button for at least 20 seconds, longer in colder temperatures like in the fall... maybe you have some corroison at fuse holders or other connections, mine has a fuse at the back of the panel (20 amp,IIRC) and another in line before the starter, also 20 amp and I did have problems with bad contacts at these fuses so I installed new fuse holders and fuses
Dwight Veinot C&C 35 MKII, *Alianna* Head of St. Margaret's Bay, NS d.ve...@bellaliant.net On Tue, Aug 11, 2015 at 12:15 AM, David Knecht via CnC-List < cnc-list@cnc-list.com> 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 > > > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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