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Genuine Mazda RX-7 Alternator
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3 Alternators found
Mazda RX-7 Alternator Part Number: N304-18-300R-00
Mazda RX-7 Alternator Part Number: N320-18-300R-00
Mazda RX-7 Alternator Part Number: N350-18-300R-00
Mazda RX-7 Alternator
The Mazda RX-7 Alternator converts engine movement into a continuous flow of electricity which keeps the battery charged and all the lights, gauges, and stereo active. The Mazda Alternator unit is mounted in two halves of cast aluminum, with a stationary stator and a rotor driven by a belt and spinning within the case, the pulley-mounted fan forcing cooling air through the case. The rotor has its magnetic field sweep the windings, causing AC current, which is immediately turned into DC in a rectifier containing heat-sunk diodes which is applied all over the car. Bearings hold the shaft on both ends and field current moves from the carbon brushes to the rotor, enabling output to increase and decrease with the demand. Voltage should remain within a narrow range, and therefore early Mazda sports coupes were fitted with standalone or internal regulators, but later models allowed the powertrain control module to be applied, and it would change field strength on the fly. The basic hardware remained the same across the RX-7 series, but capacity increased and the regulation moved outside boxes to PCM control, providing more consistent power to increasing electronic loads. All Mazda Alternators thus combine light aluminum, forced air cooling, solid-state rectification and electronic control to provide reliable current at idle or redline, and the Alternator is as much a part of everyday driving as the rotary.
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Mazda RX-7 Alternator Parts and Q&A
- Q: What are the key maintenance and servicing considerations for an alternator on Mazda RX-7?A:The alternator inducts current in the stationary windings and leaves the field in the rotor which produces brushes with small current carrying a long life. An important factor of the alternator maintenance is to ensure that the drive belt is tensioned properly, and it does not have any wear or damages after a certain time. When maintaining the charging system it is important not to short across or ground any of the terminals on the alternator. Inverting the battery cables, even temporarily, may cause the reverse polarity current flow with possible destruction of the diodes in the alternator. In order to prevent damaging the diodes, one should consider disconnection of the alternator leads during any electric welding on the vehicle. Diagnosis is normally conducted by ensuring that the problem is in the alternator and not just a replacement of parts. A full alternator overhaul involves soldering and availability of replacement parts that in some cases are difficult to get, so it is more consumer friendly where home mechanics look at overhauling a whole alternator to a brand new or rebuilt one.
- Q: How to determine whether the issue with a malfunctioning charging system lies with the alternator or the regulator on Mazda RX-7?A:In case the charging system is not operating properly as was indicated by alternator warning light still on or battery being constantly discharged, then it is necessary to determine whether the problem in the charging system is with the alternator or regulator. When the alternator is to be tested, it can be tested in the vehicle, which means that the engine was started and is running. In subsequent models with an inbuilt regulator, testing requires special equipment. Start by removing the wire attached at the B terminal at the back of the alternator and place an ammeter between the alternator terminal and the wire. The next step is to remove the electrical coupler off the regulator and wire the male and female spades together with jumper wires. Switch the engine on and check the ammeter value keeping the engine speed at 2000 rpm. At last, unscrew a wire of the connector marked F and momentarily short it to connector marked A. A big rise in meter reading denotes that the regulator is faulty whereas no change implies that the alternator is faulty.
