Grounding Practices - Perkins 854E-E34TA Operation And Maintenance Manual

SEBU8726
To help prevent sparks from igniting combustible
gases that are produced by some batteries, the
negative "−" cable should be connected last from the
external power source to the negative "−" terminal of
the starting motor. If the starting motor is not
equipped with a negative "−" terminal, connect the
cable to the engine block.
Check the electrical wires daily for wires that are
loose or frayed. Tighten all loose electrical
connections before the engine is started. Repair all
frayed electrical wires before the engine is started.
See the Operation and Maintenance Manual for
specific starting instructions.

Grounding Practices

Illustration 12
Typical example
(1) Ground to battery
(2) Primary position for grounding
(3) Ground to engine block
(4) Ground to starting motor
Illustration 13
Typical example
(5) Ground to battery
(6) Ground to engine block
(7) Primary position for grounding
Correct grounding for the engine electrical system is
necessary for optimum engine performance and
reliability. Incorrect grounding will result in
uncontrolled electrical circuit paths and in unreliable
electrical circuit paths.
Uncontrolled electrical circuit paths can result in
damage to engine components.
Engines that are installed without engine-to-frame
ground straps can be damaged by electrical
discharge.
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To ensure the engine and the engine electrical
systems function correctly, an engine-to-frame
ground strap with a direct path to the battery must be
used. This path may be provided by way of a direct
engine ground to the frame.
The connections for the grounds should be tight and
free of corrosion. The engine alternator must be
grounded to the negative "-" battery terminal with a
wire adequate to handle the full charging current of
the alternator.
The power supply connections and the ground
connections for the engine electronics should always
be from the isolator to the battery.
15
Safety Section
Electrical System
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