jeffsnook

Thanks for all the suggestions. We're still poking around!

We have recently acquired a 1971 240 and have been going through it's various problems. As delivered to us the tachometer was not working. The power wire from the ballast resistor to the tach (green/white) and the return wire from the tach to coil (black white) were disconnected and a short jumper from the ballast to the coil was installed to allow the engine to run. There is no continuity through the tach circuit as measured at the connectors hanging loose near the coil. If I use a test light to check for voltage I get a good bright light at the resistor, but if I properly connect the tach circuit the light is very dim which I am assuming is a direct short somewhere in the vehicle. I have the factory shop manual and wiring diagrams, but am lost as to which multiplug in the passenger side footwell contains the wires from the coil connections, as the color codes are used for more than one system. I am very familiar with this type of inductive tachometer, as I work on many British cars that use a similar system, but tracing the circuit path in this car has proven quite frustrating. Any guidance would be greatly appreciated.