Service Manual — page 582 of 715

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16-22 ELECTRICAL SYSTEM
Precautions
  There are a number of important precautions that are
musts when servicing electrical systems. Learn and ob-
serve all the rules below.
○Do not reverse the battery cable connections. This will
  burn out the diodes on the electrical parts.
○Always check battery condition before condemning other
  parts of an electrical system. A fully charged battery is a
  must for conducting accurate electrical system tests.
○The electrical parts should never be struck sharply, as
  with a hammer, or allowed to fall on a hard surface. Such
  a shock to the parts can damage them.
○To prevent damage to electrical parts, do not disconnect
  the battery cables or any other electrical connections
  when the ignition switch is on, or while the engine is
  running.
○Because of the large amount of current, never keep the
  starter button pushed when the starter motor will not turn
  over, or the current may burn out the starter motor wind-
  ings.
○Take care not to short the cables that are directly con-
  nected to the battery positive (+) terminal to the chassis
  ground.
○Troubles may involve one or in some cases all items.
  Never replace a defective part without determining what
  CAUSED the failure. If the failure was caused by some
  other item or items, they must be repaired or replaced, or
  the new replacement will soon fail again.
○Make sure all connectors in the circuit are clean and tight,
  and examine wires for signs of burning, fraying, etc. Poor
  wires and bad connections will affect electrical system op-
  eration.
○Measure coil and winding resistance when the part is cold
  (at room temperature).