The engine should turn over whether the glow plug button is depressed or not. Twelve volts should go to the ignition switch. The other side of the ignition switch should go to the starter button and to the glow plug button. Depressing the glow plug button will energize the glow plug. Then depressing the starter button while still depressing the glow plug button should start the engine. However, if the engine is warm, you should be able to start the engine by just depressing the starter button.
If the red-yellow wire is only showing eight volts at the solenoid when the starter button and the glow plug button are depressed, trace the wire to see whether there is a bad connection somewhere in the circuit. It's also possible that the starter button is bad, but appears good when there isn't much current being drawn. Try shorting the starter button while depressing the glow plug button. If you get twelve volts at the solenoid, you have a bad starter button. Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR 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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