Isuzu AU-4LE1T, Руководство по обслуживанию

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(2) Alternator Servicing
1) The polarity of the alternator is negative grounding type.
When an inverted circuit connection takes place, the circuit will be in
short circuit instantaneously resulting the alternator failure.
2) Do not put water directly on the alternator. Entry of water into the
alternator leads an electrolyte corrosion causing an alternator failure.
Pay attention particularly when cleaning the engine.
3) When the battery is charged with an external electric source, be sure to
disconnect the battery cables.
(3) Wiring Connections
Check all of the electric wiring connections for looseness and damage.