Tommy Gate Recommended Electrical Wiring Guidelines TOMMY GATE
The original
hydraulic lift
®
TOMMY GATE
The original
hydraulic lift
®
DPN: 095120 Rev 6 4-12-23
of 11Page 11
WIRE ROUTING
(1) When routing wires, avoid heat (above 180ºF), abrasion, vibration, metal edges, screws, and trim fasteners. If
such routings are not possible, protective devices must be used. If wires must cross a metal edge, the edge
should be covered with a protective shield and the wiring fastened within 3 inches on each side of the edge.
(2) Grommets must be used where wires pass through holes in sheet metal, castings, and / or frame rails. Do not
bend wires in a radius smaller than 10 times the wire diameter.
(3) Routing wires into areas exposed to wheel wash should be avoided. If this cannot be avoided protective shields
are required to protect the wires from stones, ice, salt and water damage. Provide a drip loop to prevent
moisture from being conducted into switches, relays, circuit breakers, and fuses.
(4) Wires should be supported every 18 inches with plastic zip ties or rubber-lined clips.
(5) Wires must be routed to clear moving parts by at least 3 inches unless positively fastened or protected by a
conduit. If wiring must be routed between two members where relative motion can occur, the wiring should be
secured to each member, with enough wire slack to allow flexing without damage to the wire.
(6) Maintain at least a 6 inch clearance from exhaust system components. If this is not possible, high temperature
insulation and heat shields are required. Existing OEM heat shields, insulation, and wire shielding must be
maintained.
(7) Do not route or attach electrical wires to fuel lines. Route electrical wires at least 1-1/2 inches away from the
engine.
BATTERY, WIRE, TERMINALS, AND CONNECTORS
(1) Wire attachments at the battery must be protected from tension loads so there is no undue strain on the battery
terminals. Wires should be routed down rather than horizontally from the terminals with no sharp bends
adjacent to the connections.
(2) Battery power for your Tommy Gate should come directly from the battery through the supplied circuit breaker
or fuse. The circuit breaker or fuse should be installed as close to the battery as possible.
(3) Do not splice battery cables. If splicing is necessary, the most durable splice joint will be bare metal barrel
crimped, flow-soldered and covered with adhesive lined heat shrink tubing. Strip the wire ends making sure
that individual conductor strands are not damaged. Use only rosin core solder, proper crimping tools, and wire
with a gauge at least equivalent to the circuit being lengthened. Do not use electrical tape.
(4) Battery cable terminals will be bare metal barrel crimped or flow-soldered and covered with adhesive lined heat
shrink tubing.
(5) Use wire connectors with locking features such as positive locking, inertia locking, bolt together, and soft
mold-over with locking external retainers.
GENERAL
(1) All frame contact areas must be wire brushed to bare metal, free of paint, dirt, and grease. Frame connections
must be made using hardened flat washers under the bolt head and lock nuts. Corrosion preventive grease or
compound is to be applied to the terminal area of the frame connection.
(2) Frame cross members are not recommended as part of the ground return.
(3) All circuit breakers and fuses should be located in one easily serviceable location with a means provided for
identification of circuit function and current rating. Do not put circuit breakers or fuses in the vehicle cab.
(4) Before welding to the chassis disconnect the battery. Also disconnect the power train, engine, valve, and
transmission control modules.
(5) Do not alter vehicle ignition, starting, and / or charging systems. Do not reroute engine compartment wiring.
(6) Full copper circuitry and standardized polarity grounds are recommended.
(7) Never increase the rating of a factory installed fuse or circuit breaker.
(8) Disconnect the battery negative (ground) wire prior to any vehicle modification.
Following the above guidelines will provide you with years of trouble free service. Failing to incorporate the above
guidelines will result in a voided warranty. Non-compliance with the guidelines above may result in a failure of
electrical components, shutdown of engines, loss of backup brake systems, and the possibility of fire.