I HAVE A1997 I REPLACED THE BATTERY AN ALTERNATOR AN WHEN I DRIVE IT AT NITE IT DRAINS MY BATTERY TILL IT SHUTS DOWN WHAT IS CAUSING IT
1997 Ford Expedition • 192,000 miles
It just turns off cmpletlly
December 3, 2011.
December 3, 2011.
Dont know what the charging system is? lights flicker, radio flickers and headlights start to dim.. it wont crank.. we let it sit overnight and in the morning it started up, but again the same happened. it does start when we jump it.
What you need to do is have the system tested, . . . or you can do it yourself with an inexpensive digital voltmeter. It sounds like it isn't working. First measure the battery voltage with the engine off. I can walk you through setting up and using the meter if necessary. The voltage will be 12.6 volts if the battery is good and fully charged. It will be closer to 12.0 volts if it's good but discharged. If you find it closer to 11.0 volts or less, the battery has a shorted cell and must be replaced.
Next, measure the battery voltage again with the engine running. It must be between 13.75 and 14.75 volts. If it's low, you'll need to measure the voltages on the wires on the generator. Those will help determine the next step in solving the problem.
You can find a perfectly fine digital voltmeter, (VOM), for around six bucks on sale at Harbor Freight Tools if you have one of those stores nearby. Walmart, Radio Shack, Sears, and any auto parts stores and hardware stores sell them too but there are many with features you don't need along with the much higher cost.
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