Haltech E6A - Manual (Page 121)

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Figure E8. Illustrates Charge Time & Break Time
Constant charge time ignition using a dumb igniter is moderately inferior to that using an
intelligent igniter with dwell control as it does not compensate for power variations or thermal
effects.
NB: For safety and reliability, always use igniters that are internally current limited.
The Output Trigger Edge
The Haltech Ignition Module operates on a falling edge. This means that the spark is fired
when input trigger signal drops to 0 V. Many, but not all, OEM ignitions operate with the
same trigger logic. Most after-market ignition systems fire their spark on the rising trigger edge
(same as points). Make sure that you set the ignition output trigger edge correctly. If set to the
wrong edge, the timing will be out by significant amount and engine damage may result.
E.5 Alternate Ignition Systems
The output of the Haltech Ignition Module can be used to trigger after-market ignition systems
such as MSD or Jacobs. There are several reasons why it is not normally possible to directly
connect the ignition output of the E6A ECU to the trigger input of one of these systems. The
main reasons are lack of dwell control and the signal polarity is the inverse of the polarity
required by most of these systems. It is possible to invert the ignition output of the E6A