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• Check for defective connections caused by loose terminals, by
rust on terminals, or by contamination of terminals by foreign
substances.
(2) Checking for loose terminals
• If connector terminal retainers become damaged, male and fe-
male terminals may not mate with each other when the connec-
tor bodies are fitted together. To check for such terminals, gently
pull each wire and see whether any terminals slip out of their
connector housings.
1.3 Inspections when a fuse blows
• Remove the fuse, then measure the resistance between ground
and the fuse’s load side.
Next, close the switch of each circuit connected to the fuse. If the
resistance measurement between any switch and ground is ze-
ro, there is a short circuit between the switch and the load. If the
resistance measurement is not zero, the circuit is not currently
short-circuited; the fuse probably blew due to a momentary short
circuit.
• The main causes of short circuits are as follows:
• Harnesses trapped between chassis parts
• Harness insulation damage due to friction or heat
• Moisture in connectors or circuitry
• Human error (accidental short-circuiting of components)
2. Service Precautions for Alternators
• When servicing alternators, observe the following precautions:
• Never reverse the polarity of battery connections.
If the polarity of the battery connections were to be reversed,
a large current would flow from the battery to the alternator,
damaging the diodes and regulator.
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