Wiring Harness
Wiring Harness Installation Notes:
• The wiring harness should be kept away from ignition components (ignition boxes, coils,
distributors, etc.) as much as possible. Do not bundle the wiring harness together with other
“noisy” wiring in the vehicle.
• As with any wiring, it is good practice to avoid routing the wiring harness around sharp edges
or near high temperature components such as headers.
The wiring harness consists of the following connections:
BATTERY POS (loose wire)
BATTERY NEG (loose wire)
These must be connected DIRECTLY
to the positive (red wire) and negative (black wire)
posts of the battery. These must be run independently to the battery. Do NOT splice other
power or ground wires into these wires. Failure to follow these requirements invites problems
with electrical noise. These kinds of problems are difficult to diagnose. The wires may be
extended if needed using automotive grade 16 gauge (or larger) wire.
12V SWITCHED (loose wire)
Connect this wire to a switched ignition source that is hot with the key in the On/Run and
Crank positions. Do NOT connect to the positive side of an ignition coil. Strange problems can
sometimes arise when tapping into existing switched ignition sources. When in doubt, run this
wire through its own switch and then directly to the positive post of the battery.
TRANS
This connects to the round connector on the passenger side of a 4L60E transmission. Or on the
driver side of a 4L80E or TCI® 6x Six-Speed transmission.
NOTE: Pre-1993 4L80E’s will need an updated internal wiring harness. TCI® PN 276610, GM
PN 24200161 or equivalent.
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