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b.
If there are more than two wires, only an oscilloscope will be 100%
accurate in locating the tach wire, but a digital voltmeter will often suffice.
Set the meter to read AC volts, connect the negative lead of the meter to
ground and probe the suspect wires with the positive lead. The wire that
has the highest AC voltage while the engine is running is usually the tach
wire. Connect the Black/Gray wire from the control module to this wire.
3.
If the vehicle does not have a separate coil, look for the tach wire in a plug
coming out of the distributor. If no distributor can be found, the vehicle may have
multiple coils. Each coil usually has an ignition and a negative coil wire. Connect
the Black/Gray wire from the control module to the negative coil wire.
4.
If no coil or distributor can be found, use p/n 454T monitoring module on the
alternator.
5.
On almost all fuel injected vehicles, you can connect to the negative side of any
fuel injector. Most fuel injectors are mounted directly into the intake manifold and
typically have two wires. One wire is the ignition and usually has a color
common to all fuel injectors. The other side is negative and can be tested as
described in step 2b above.
speed connection
Use the tachometer wire input for speed sensing input. The vehicle must be equipped
with electronic speed sensing. Speed sensing can be found at the instrument cluster,
ABS sensor, transmission box or radio (on some European models and some Fords).
final wiring connections
N N O O T T E E : : Do not insert the fuses into the fuseholder until all wiring is completed and verified.
Connect the RED wire to the 5amp fuseholder.
Connect the RED/WHITE wire to the 20amp fuseholder.
Attach the two fuseholders to the battery positive cable clamp.
Attach the BLACK wire to the battery negative cable clamp.
© 2005 directed electronics—all rights reserved
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