3.0
TOOLS NEEDED
In addition to your regular tools, you will need, at least, the following:
Crimping tool
NOTE: USE A QUALITY TOOL TO AVOID OVER-CRIMPING.
Wire stripper
Continuity tester
CAUTION: DO NOT USE A TEST LIGHT TO TEST THE COMPUTER OR
SENSOR WIRING OR YOU WILL DAMAGE THE COMPUTER.
Electric drill
1 5/8" Hole saw (for the rubber grommet in the firewall)
4.0
PRE-INSTALLATION AND HARNESS ROUTING GUIDELINES
The installation of your harness kit will consist of two parts:
~
The physical routing, positioning, and securing of the harness, wire groups, and individual wires and
connectors.
~
The proper electrical connection of the individual circuits.
We cannot tell you how to route the harness in your automobile. That depends a great deal upon the particular make of the
automobile and what extent you want to secure and conceal the harness. We do offer some general guidelines and routing
practices starting in
Paragraph 5.3
, general installation instructions in
Section 5.0
, and precise instruction concerning the
electrical connections you will have to make beginning in
Section 6.0
. To help you begin thinking through the installation of
your wire harness, read the following sections:
4.1 TRANSMISSION
FUNCTION
4.1.1
If you are using the 4L80E transmission, you must use the vehicle speed sensor (VSS), and the correct
brake switch. These are necessary to make the transmission work correctly. The vehicle speed sensor lets
the computer know how fast the wheels are turning. The brake switch should be closed (electrically
connected) when the brakes
ARE NOT
being applied and open (not electrically connected) when the
brakes
ARE
being applied. This is the opposite of a standard brake light switch. If you are using a pressure
brake switch, a
SPDT
relay must be installed to unlock the converter when the brakes are applied.
See
Figure 6.3
4.2
YOU SHOULD GET TO KNOW THE PARTICULAR ENGINE YOU ARE USING
:
NOTE:
The 96-00 7.4 had four oxygen sensors from the factory, but the harness has provisions for only two,
one on the driver side and one on the passenger side of the engine. We removed the rear oxygen
sensors since they originally were behind the catalytic converters and most people don’t want to run
more than two oxygen sensors. This system has four rectangular connectors at the computer. A
#16229684 computer is required for proper operation.
4.2.1
PPPI recommends the use of the following parts. See
Table 4.1
. These will meet all requirements and are
compatible with PPPI harnesses. The numbers given are GM and AC Delco part numbers.
You must use
the computer listed on table 4.1 with our harness.
4.2.2
Familiarize yourself with the harness by locating each of the harness groups and by looking at the
connectors on the wire ends.
4.2.3
Decide where and how the computer, fuse block and relays will be mounted. PPPI wire harness kits are
designed to mount the computer either under the dash or in the kick panel on the right side. They must be
no further apart than the wiring will allow (approx. 18 inches).
4.2.4
A good exercise is to lay out the wire harness on the floor beside your vehicle and identify all the
connectors and wires.
4.2.5
You will want to route the harness through and around open areas. Inside edges provide extra
protection from hazards and also provide places for tie wraps, clips and other support.
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