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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