Ignition Box; Pulse Generator Coils - Rothewald 10002567 Mode D'emploi

ballast resistors in the ignition circuit).
If the measured value is smaller than this, there is a fault in
the feed cables (e.g. verdigris in the cable core), a plug, the kill
switch or ignition switch. In this event, damaged cables should be
replaced and plugs and switches tested for contact resistances.
To do this, disconnect the battery, set the multimeter to measuring
range 200 ohms, carry out a continuity test (see above), hold
test probes against the cable entries of the switch or plug. If
the measured value is greater than approximately 0 ohms, this
indicates faults, dirt or corrosion damage. Clean components
as far as possible, apply a little contact spray and then measure
again. The ignition coil itself can be tested with the multimeter for
line break and short circuit but not for interturn faults or disruptive
discharges at high voltage. There is another factor to consider,
namely that ignition coils frequently only start to malfunction once
a certain operating temperature has been reached. To test the
coil, disconnect it from the vehicle electrics. Set the multimeter to
measuring range 200 ohms, perform a continuity test (see above),
hold the red test probe against the positive and the black test
probe against the negative terminal, then compare the result with
the reference value for the coil's primary winding, as specified in
the workshop manual.
Then set the measuring range of the multimeter to 20 kOhms and
test the secondary winding. With a double ignition coil, the test
probes are held against the two high-voltage ignition cables. In the
case of an ignition coil with a single ignition cable, hold the red test
probe against the positive feed and the black test probe against the
high-voltage ignition cable. Then compare the measured value with
the reference value from the workshop manual.

6.2.2 | Ignition box

Ignition boxes are extremely sensitive components and should
always be tested by a workshop that has the relevant special
testing device.

6.2.3 | Pulse generator coils

Electronic ignition systems receive their pulse from a rotor finger
that is usually attached to a crankpin and activates a pulse
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