Chevrolet IMPALA 3.9L 2009, Cng System Installer Manual, Page: 20 / 32

© 2009 IMPCO Technologies, Inc. -18- 2009 3.5/3.9L Impala CNG
Soldering Crimps & Terminals:
Solder all terminals after crimping as illustrated using an electronic grade, rosin core solder (0.7 to
1.0mm diameter works best). Make sure all wires in the terminal receive adequate solder to ensure
a permanent connection.
“Barrel” Style Lug Terminals
Heat the terminal and apply the solder from the
lug side of the crimp to minimize “wicking” solder
up the wires, which may lead to wire breakage.
Securing the wires to the battery cables will help
minimize this risk.
“U” Style Splice Crimps
Heat the terminal and apply the solder in the
center of the crimp fold, allowing it to “wick” into
the joint. Do not worry if some of the solder wicks
into the wires as they will be secured by the wiring
loom.
Shrink Wrapping Connections:
Shrink wrap all splices and the positive battery lug. Cut the adhesive lined shrink tubing into 1 to 1
½” (25-38mm) pieces. Use a heat gun with a U-shaped nozzle to heat the shrink tubing uniformly
as illustrated.
IMPORTANT!
Familiarize yourself with ALL schematics and electrical diagrams BEFORE splicing wires.
Some of the modules and Sequent ECU share the same electrical connections (splices).