Electrical System - Perkins 2506 Operation And Maintenance Manual

SEBU8313-02

Electrical System

Never disconnect any charging unit circuit or battery
circuit cable from the battery when the charging unit
is operating. A spark can cause the combustible
gases that are produced by some batteries to ignite.
To help prevent sparks from igniting combustible
gases that are produced by some batteries, the
negative "−" jump start 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 jump start cable to the engine block.
Check the electrical wires daily for wires that are
loose or frayed. Tighten all loose electrical wires
before the engine is started. Repair all frayed
electrical wires before the engine is started. Refer to
the "Engine Starting" section of this Operation and
Maintenance Manual for specific starting instructions.
Grounding Practices
Illustration 11
Typical example
Grounding Stud To Battery Ground
i02469632
Illustration 12
Typical example
Alternate Grounding Stud To Battery Ground
Proper grounding for the engine electrical system is
necessary for optimum engine performance and
reliability. Improper grounding will result in
uncontrolled electrical circuit paths and in unreliable
electrical circuit paths.
Uncontrolled electrical circuit paths can result in
damage to main bearings, to crankshaft bearing
journal surfaces, and to aluminum components.
Engines that are installed without engine-to-frame
ground straps can be damaged by electrical
discharge.
To ensure that the engine and the engine electrical
systems function properly, 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 starting
motor ground, a starting motor ground to the frame,
or a direct engine ground to the frame.
g00771448
15
Safety Section
Electrical System
g00771487