Question about Cars & Trucks
1998 infiti i30 new alternator, drive belt, and battry been replace what all i need to check to fix the problem? the alternator voltages is around 13.4
An alternator converts rotary energy into electrical energy by moving a magnetic field (the armature) thru the coils in the housing. The magnetic field MUST be present for the alternator to generate electricity. It is initially created by the excitation current that is supplied thru the charging warning light and the parallel resistor (mounted on the back of the voltage gauge). If the excitation current is too weak (bad resistor, bad bulb, bad connection), but present, the alternator will start charging ONLY at higher RPM levels. If the excitation current is not present at all, the alternator will never charge.
Once the alternator starts charging, it supplies its own field current. Since there is now voltage on both sides of the light/resistor combo, the light goes off. Once the alternator starts charging, the light/resistor combo has no effect.
If the charging warning light is on, there is voltage on one side of the bulb and not the other, and there is a problem, usually in the alternator.
The alternator coils produce AC voltage, which is not useful for our purposes. The alternator includes six charging diodes (one-way check valves for electricity) that convert the AC voltage to slightly-pulsing DC voltage. If one diode is failed open, the charging amperage will be reduced. If one diode is failed shorted, there will be AC ripple in the output voltage, and you will get whine in the radio. As more diodes fail, the conditions will worsen.
Posted on Aug 21, 2018
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Posted on Sep 08, 2018
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Posted on Jan 02, 2017
Don't raise the idle speed, because that will adversely affect the engagement of reverse and drive and cause the car to creep forward at stop lights. Most likely there is a shorted diode in the alternator rectifier. If you can find a rectifier at a parts supplier, it is not difficult to install. Otherwise, you will have to replace the alternator.
Posted on Aug 08, 2018
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