Tec3r Manual Version 1.11
- Page 37 -
©2017 Electromotive, Inc.
since the anodizing acts as an electrical insulator. Also, loose coil screws may cause an electrical shock as
well, since they must be grounded to the case at all times.
Always make sure that both the coil screws
and the ground wire are securely fastened.
After the DFU has been grounded, the rest of the wiring may begin. The DFU’s come shipped with
the appropriate connectors. Terminal D on all DFU’s should be connected to a
FUSED 12 VOLT SOURCE
that can pull
10 AMPS
of current. In the wiring harness, the outputs for Coils A, B, and C are routed in the
same shielded-cable housing. On an 8 cylinder, 6 cylinder twin-plug or 12 cylinder application, the outputs
for DFU 2 (A2, B2, and C2) are routed in a separate shielded-cable housing. These are all 9amp pull-to-
ground outputs; that is, they create a ground path every time a coil charges. When the coils fire, the outputs
“float,” with no connection to ground or power. If the wires need to be spliced or lengthened, 16awg wire
should be used. See
Figure C.1.1
for details on the coil outputs in the wiring harness.
Figure C.1.1 :
ECU Coil Output Wires (note: shield wire is connected inside the TEC unit,
not at the coils
).
WARNING:
The DFU chassis MUST be grounded. A ground wire must be connected to battery
negative, or to a good chassis ground.
FAILURE TO GROUND THE DFU’S MAY RESULT IN
SEVERE ELECTRICAL SHOCK!
Also, poorly grounded DFU’s may result in poor engine
performance, and can cause engine damage!! Use the drilled and tapped hole next to the
yellow connector for the ground wire. If desired, the unit may instead be grounded at one
of the four bolt holes. However, you will need to scrape off the anodizing under the bolt
head. The anodizing is an electrical insulator, so unless it is scraped down to bare
aluminum, it will not provide a good connection to ground. If more than one DFU is used on
a vehicle, each one will require its own ground wire.
Additionally, make sure that the coil screws are fully tightened at all times!!
C.2. DFU to Spark Plugs
The coils fire in a specific order for each engine configuration. The proper coil must be connected to
the correct cylinder in the firing order.
