The alternator provides 100% of the engine's electrical potency after it starts.
The days of removing the contrary battery cable with the engine running in array to finish provided the alternator is functioning properly are faraway absent. The electronics in nowadays's computer-controlled vehicles can be seriously damaged by a voltage Nail ended the electrical transaction when the battery is disconnected with the engine running. Test the battery voltage a final time. The voltage should stay above 13.8 volts. Replace the alternator if the battery voltage drops below 13.8 volts when the accessories are turned on and does not recover rapidly to the proper range.
Distance the transmission in "Field" and handle the parking brake securely. Turn the ignition fundamental to the "Off" position and wait Ten minutes To admit any timed circuits, such as automatic headlights, to completely turn off.
2. Locate the digital volt/ohm metre to peruse D/C volts. Touch the confirmation leads of the digital volt/ohm metre to the battery terminals. Charge the battery before continuing testing whether the voltage is below 12.5 volts. A partially discharged battery can explanation a ace alternator to crack defective.
3. Clip the attempt shine cable to the contravening battery proclaim. Touch the probe end of the test light to the charging post -- the large gauge battery charging wire is bolted to the charging post -- on the back of the alternator. Repair the broken wire or replace the charging system fuse if there is no voltage at the charging post and the test light doesn't turn on.
4. Turn off all accessories, such as the stereo, headlights and the blower motor. Start the engine and check the battery voltage again, in the same manner as before. With the engine running, the battery voltage should be between 13.8 and 14.8 volts. Replace the alternator if the observed voltage, when the engine is running, is not in this range.
5. Turn the blower motor on high and turn the high beam headlights on. Correct diagnostic procedures and Accoutrement must be used to safely countdown the charging method in trail to prevent damage to touchy electronics. On the other hand, still liable the electrical method concerns, the criterion at ease mechanic should be capable of accurately diagnosing alternator problems.
