Pick-Up Coil
NOTE:
Operation of the vacuum mechanism may cause a trigger wheel tooth and the pick-up coil pole piece to align and the ohmmeter pointer to deflect. This deflection should not be interpreted as the result of a faulty pick-up coil.
- Identify the 2 pick-up coil lead wires. On most applications, these wires are 1 Green and 1 White. The pick-up coil connector must be disconnected from the module, then an ohmmeter is connected to 1 connector terminal and to the distributor housing. Next, the ohmmeter is connected to both terminals.
- Connect external vacuum source to vacuum advance unit. If vacuum advance unit is inoperative, replace unit. Connect an ohmmeter, using mid scale, to either pick-up coil terminal and the distributor housing.
- Operate the vacuum pump and observe the ohmmeter throughout vacuum range. Reading should be infinite at all times. If not, replace pick-up coil. See meter "A" in Figure.
- Connect ohmmeter to both pick-up coil connector terminals. Operate vacuum pump and observe ohmmeter throughout the vacuum range. Also, flex wires by hand to locate any intermittent defective connections at pick-up coil and at terminals on ends of wires.
- The ohmmeter should indicate a constant resistance in the 500-1500 ohm range at all times. If not, replace the pick-up coil. See meter "B" in Fig 1