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2-10 Electrical
Section 2: Electrical
• Scroll — Similar to convolute, but without the ridges. Scroll is used where harness rigidity is
required, especially for maintaining critical locator dimensions. Use scroll for short lengths only,
as it is quite inflexible.
Note: This is not meant to be an all-inclusive list of methods for physically protecting the wires.
There are other means of protection available that are not listed.
Grommets and Sealing Requirements
Any additional wiring routed through sheet metal must pass through a grommet that both seals the
opening and locates the wire(s). Two-piece grommets (rubber with plastic inserts) are
recommended to facilitate installation and retention.
• Locate grommets so they are accessible for correct seating (achieved by pulling) in sheet metal
holes.
• Ramp grommets at the insertion end to facilitate installation and sealing.
• Be sure that the direction of the hole punch is in the direction of grommet seating and the hole is
burr-free.
• Make sure the grommet molding compound will adhere to the harness to prevent slippage.
• Make sure the grommet will withstand the environment (temperature, splash).
• Be sure that holes are large enough to allow the installation of the harness without causing
circuit damage.
• Use adhesive tape on main trunks or branches with at least a 50% overlap to prevent wicking
through grommets. Be certain to diaper-wrap the takeouts.
Wire Routing
WARNING: Do not place electrical component attachments or ground screws adjacent
to vehicle fuel tanks, fuel filler pipes, fuel lines, fuel vapor lines or carbon canisters. Failure
to follow these instructions may result in personal injury in the event of a collision.
Wire harness routing should conform to the following:
• Protect wires routed through holes in sheet metal or castings with a grommet whether or not
conduit is used (see figure below).
2010 Expedition SSV Modifiers Guide, 07/2009