Disconnect the wire to the intake pipe heater and, if present, to the automatic starter.
Remove the cover on the drainage channel.
Remove the rubber sleeve from the switch's multi-pin plug.
Applying voltage: after squeezing out the locking brackets, remove the plug.
Connect voltmeter to pins 2 (brown wire) and 4 (black wire).
Turn on the ignition. The voltage should be around 12V.
If there is no voltage, then you should look for a break in the electrical circuit.
Turn off the ignition, put the plug on the switch.
Safe shutdown: connect a voltmeter between terminal 1 and «weight».
Immediately after turning on the ignition, the voltage should be about 6.6 V.
After 1-2 seconds, the voltage rises to about 12 V. This is a safe shutdown so that the ignition coil cannot overheat when the ignition is on for a long time.
If there is immediately 12 V at terminal 1, remove the plug from the switch again.
Check the continuity of the following wires: terminal 1 (green), terminal 15 (black), weight (brown).
If no fault is found, the switch must be replaced.
Since the ignition coil can melt due to a failure of the emergency stop, the sealing compound must be checked for protrusion. If so, replace the ignition coil.
Pulse processing: disable (neutralize) ignition.
Connect a voltmeter between ignition coil terminal 1 and ground.
Remove the three-pin plug on the ignition distributor.
Insert a needle, cotter pin, etc. into the middle contact.
Turn on the ignition, the voltmeter should show a voltage of 12 V after 1-2 seconds.
Touch with extended middle contact «masses» and watch the voltmeter.
In 1-3 seconds, the voltage will drop by about 6V, and then rise again to about 12V.
If the voltage remains at 12 V, then the switch is faulty.
If the voltage drops briefly, but there are no sparks. then the ignition coil is faulty or the high-voltage wire between the coil and the distributor is damaged.
The switchboard of a vehicle with a mechanical ignition timing system is usually located near the radiator for cooling (3), serving for heat dissipation. Removed multi-pin plug here (4). to see contacts (1-7) on the switch.
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