Manual

76
C.2.2 Optical Sensors
Optical sensors are often used in original equipment and may be directly connected to the IG5.
These devices require three connections:
Power (normally +12v)
Ground
Trigger output
Often distributors with this type of sensor have a rising edge trigger at 70 degrees.
Many distributors used in electronic ignition systems are fitted with mechanical and/or
vacuum advance mechanisms. These mechanisms must be locked so that the IG5 receives a
an input trigger signal with fixed relationship to crankshaft position. If you elect to rotate the
distributor housing when setting the timing relationship of the trigger signal to the crankshaft
position (the trigger angle) , read Appendix D, Rotor Phasing, first.
C.2.3 Magnetic Reluctor Sensors
Many distributors used in electronic ignition systems are fitted with mechanical and/or
vacuum advance mechanisms. These mechanisms must be locked so that the IG5 receives an
input trigger signal with fixed relationship to crankshaft position. If you elect to rotate the
distributor housing when setting the timing relationship of the trigger signal to the crankshaft
position (the trigger angle), read Appendix D, Rotor Phasing first. The magnetic reluctor is
used in distributors as well as on crank trigger units. These give a sinusoidal output signal
(see Figure E.3.5) that must be modified to a square wave with a reluctor adaptor to be used as
the trigger input signal for the IG5. Haltech can supply a Reluctor Adaptor for this purpose.
The Reluctor adaptor has two input channels; a Primary input and a Secondary input. The
Primary input is used for the main trigger, and the secondary is used for the Home or Road
Speed input. The Reluctor adaptor plugs directly into the input trigger connector on the main
harness in series with the Haltech ECU and the reluctor pick-up.
Figure E.3.5 Signal before and after reluctor adaptor
.