The service lead would not be a permenant fixture but a ford workshop tool, I doubt the CFi has one as it would have the efi self test socket.
does the meter say Autoranging, or does it have a lot of settings on the dial. Your looking for DC Volts ( there may be a button to switch from AC to DC. And if it's not autoranging you want the 20V range if it has one.
Connec the black probe to the COM on the meter and to the battery negative. connect the red lead to the V+ if it has one (NOT THE AMPS socket) it may be called something similar.
Then touch the red probe on each of the terminals on the back of the ignition barrel and report back with the wiring colours..
Which May be...
Yellow
Red
Black
Black blue
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