Question about 2001 Ford Explorer Sport Trac

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I changed the battery and alternator but battery still on low why

I check to see if it was my auto start but was told no, took alternator back to auto zone and change for another now i'm told its the alternator because its only pulling 1100 amps and should be pulling 1500 for my 2001 ford sport trac explorer

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Check all the connections as a dry /loos joint could loose amps hope this is of help Regards John

Posted on May 15, 2009


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Dear Honda Tech, i am having a problem with the charging system in my car. i have replaced the alternator with a factory direct Honda alternator that was certified good at the honda dealership before...

wow, some writeup-the voltage should be checked at the back of the alternator and the battery at the same time-if the pos post on the alternator reads 12.4 resting, that's what it should read at the battery too-and if it reads 14.4 volts running, at the battery, the alternator should read that too-if it does not (alternator reads 11.8, battery reads 12.40 it is the alternator. If the alternator reads 14.4 and the battery reads 12.4, the issue is wiring or the ecm is not allowing current to flow to the battery-there is an internal regulator in the alternator, but the ECM, if defective, can cause your issue. Check for relays or fuses that might be bad first, but it sounds like your ECM may be the problem and now you probably have another alternator issue which will have to be corrected first-then check the resting and running voltage at both places, and go from there. Testing an alternator off the car only proves it is good (or bad) off the car-therefore you need to determine what changes when mounted, and it can only be wiring (harness) , or control (ECM)

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We changed the battery because nothing would come on, after changing the battery the new one died the same day, went to auto zone was told I needed a new alternator. Changed that today jumped the car and...

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