Question about 1998 Mazda Protege
Voltage regulator is built-in to the alternator assembly.
Have you tried replacing the battery?
A battery with a shorted cell will not charge properly and may even damage an alternator or regulator.
Note1: use a digital voltmeter (about $25 at Lowe's or Radio Shack) and check voltage across batt terminals while engine running. If more than 12.6 Volts DC and more typically about 13 Volts, then the alternator is working.
Note2: from Jan 98 to May 98 shows a different part # alternator than June - Dec 98
check the manufacture date on your driver door edge.
Posted on Oct 25, 2008
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Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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