<VV> FC Engine Wiring Harness

tony.. tony.underwood at cox.net
Fri Jul 24 09:46:06 EDT 2020

On 7/24/2020 7:49 AM, Hugo Miller via VirtualVairs wrote:
> Yes, if it is a 9 volt coil (or similar). In theory. there should also 
> be a 12 volt feed when the starter is operated, on the basis that when 
> the starter has taken its chunk of the available battery power, there's 
> about 9 volts left for the coil. But if that feed from the starter 
> (relay or switch) is not there, that rather defeats the pont of having a 
> 9 volt coil and resistor in the first place.
> How do you know your wire is a resistor wire and not just a 12 volt 
> feed? You can't tell with a volt-meter, as it needs a current draw to 
> show up the resistance & you will still get 12 volts on a meter, even if 
> it is a resistor wire (I think).  

Yeah you can.  Pop the distributor cap off, short the points.  Either 
use a clip lead or just bump the starter til the points close.  Turn on 
the ignition, measure voltage at the + terminal of the coil.  If the 
resistor wire is working the voltage will show low, around 8-10 volts, 
or around 3-4 volts or so lower than battery voltage depending on the 
coil. They vary.  To see if the bypass wiring is working, crank the 
engine.  The voltage on the + coil terminal should be the same as 
battery voltage during cranking.


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