Question about 1998 Ford Expedition

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Changed out altenater and battery battery is fully charged with car running altenater shows it's a drop in voltage rather than 14-15 volts it should be putting out ,had it tested showed good replaced and got the same thing do you know what would make it discharge instead of charge. when engine is off voltage slowly returns to battery

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The drive belt maybe slipping causing the alternator voltage to drop and not charging the battery up completly

Posted on Jan 18, 2009

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That is definitely wrong, not normal. Voltage should stay at 14 volts or near that until the battery is close to fully charged, then will slide down to about 13.5 volts, and stay there while engine is running. Also, a fully charged battery should show about 12.6 volts at a minimum, especially a new battery.
I don't know what is going on with your system. Take it back to Merc- were they aware of how it is acting, voltage-wise? Doesn't sound like it. One small possibility: is your alternator belt not tight enough?

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How to tell if alternator is gone on 2000 protege


Hi John, The easiest way to check the alternator is to connect a voltage test meter between the positive and negative battery terminals. A fully charged battery should give 12 and a half to twelve and three quarter volts. Have some one start the engine (making sure the vehicle is in neutral or park and with the park brake fully applied). Voltage during start should not drop to lower than eleven volts. With engine running the voltage reading should be around thirteen volts. Turn on the head lights (full beam) and the heated rear window. The voltage should be maintained or increase slightly above the previous reading. If during start up the battery voltage dropped below that stated earlier the battery will probably need replacement. If the voltages remain constant or drop during the engine run, and if voltage drops below pre start conditions, the alternator requires attention. Regards John

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How can i know if my voltage regulator is working, Im not getting any of my lights to work


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Replaced battery. still would not start. Cleaned treminal of all corrision. cranked fine. however 1 day later would not start. jump started . drove a couple of miles but when I turned on lights, engine...


Sounds like a bad alternator. Drained your battery and when you turned on the lights it took all the power left in your battery. When you drain a battery down that far, they are real hard to jump, and coupled with the alternator, the car is not producing enough current to start and stay running.

I would take the alternator off and take it to oyur local auto parts store to be tested. If bad, replace it and charge the battery fully before starting. Then check voltage at battery with motor running. Should be 13.2 -14 Volts DC. If not, you may have a bad battery cable or blown fusible link. (especially that if the alternator tests good).....Mike

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What is the expected output of a alternator in a Jeep 4.0L Sahara (yr. 2000)? My Jeep's ''check gauges'' light came on, and the battery gauge dropped to nothing. Checked the alternator (with a voltage...


You shoulld expect more than 12.8 volts from the alternator up to nearly 14 volts when charging a low battery. The battery can only show the amount of voltage your alternator is sending to it after being used for a while. I would suggest that you have the battery tested & recharged completely, your voltage will be above 12 volts and if it returns to below that , you will know your alternator is not charging. Also, if you test the output of the alternator and see it is below 12 volts after the battery is fully charged at 12+ volts you will have confimed the problem also.

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