Warning: This test requires special care, because the system generates very high voltage at the spark plugs.
Method using a calibrated ignition tester
1. If the engine cranks but does not start, disconnect the lead wire from any spark plug and connect it to a calibrated ignition tester. If a universal tester is not suitable, select an analogue for Ford car ignition systems.
2. Connect the tester clip to the bolt or bracket on the engine (see picture), crank the engine, watching the tester, bright blue, clearly visible sparks should appear.
3. If there are sparks, then the candle receives sufficient voltage for it (the test must also be carried out on the remaining candles to make sure that everything is in order with the distributor cap and slider). Remove the spark plugs and check them as described in chapter 1.
4. If there are no sparks, remove and check the distributor cap and slider as described in chapter 1. Clean the cover and slider, then reinstall them and recheck.
5. If there is no spark, disconnect the coil wire from the distributor cap and connect it to the tester (reconnect the spark plug wire to the spark plug), then recheck.
6. If there are no sparks, check the primary (thin) wires on the coil, they must be clean and connected tightly. To check the voltage supply circuit to the ignition coil, see section 6.
7. The appearance of sparking after this indicates a malfunction of the distributor cap, slider, wires to the candles, the candles themselves (candles), individually or all of them combined.
8. If after that there is no spark, then check the resistance of the wire going from the coil to the distributor cap with an ohmmeter and compare it with that given in the specification. If everything is in order with the wire, then the ignition coil or other internal elements may be faulty.
Alternative method
Note: if you do not have a calibrated ignition tester, you can simply bring the wire to be tested to a distance of 6 mm instead (1/4 inch) To "mass", supporting it with an insulated tool while turning the engine. This method will help determine the presence of a spark in the system, however, you will not be able to determine whether there is enough voltage for complete combustion of the mixture in the cylinders.
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