Weak battery/alternator (2006)? - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 12 (permalink) Old 03-31-2019, 04:01 PM Thread Starter
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Weak battery/alternator (2006)?

My car's battery and alternator were both replaced a year ago (by the previous owner), I have the receipt.

The problem is that when the A/C is on, or when I press the power window buttons, the car's RPM goes up a little bit as if to compensate for the load. Right before doing this, you can see the lights dim a little.

The battery's voltage is at around 12.5 with the car off, when I put max load on it (AC, windows, lights) it drops to 11.5 or so. With the engine on, it behaves the same. Though the voltage is 14.3 but there's still a drop in voltage to 13.5 more or less.

Only other "electrical" issue I have is the fuel gauge not working, despite the sending unit being fine (tested). I guess I have to test the wires to sort this one out.
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post #2 of 12 (permalink) Old 03-31-2019, 04:30 PM
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I would say that maybe pretty close to normal with maybe the slight exception that the IAC valve is a little slow. Is it a Motorcraft or Ford OEM?
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post #3 of 12 (permalink) Old 03-31-2019, 04:59 PM Thread Starter
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I "think" mine's OEM. Last month I used IAC cleaner on it but I think it hardly did anything, it looked quite dirty inside. Though the air intake number on the scan tool went up a bit.
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post #4 of 12 (permalink) Old 03-31-2019, 05:33 PM
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Sounds like the IAC may be a touch sticky/slow, everything else in the description sounds normal. A thorough cleaning might be in order, if replacement is necessary fo Motorcraft only, aftermarket IACs are a nightmare.

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post #5 of 12 (permalink) Old 03-31-2019, 09:28 PM
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Is your '06 a ffv?
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post #6 of 12 (permalink) Old 03-31-2019, 10:04 PM Thread Starter
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Nope, it's gas. Sorry for not specifying.


I'm gonna try to clean up the IAC again and see if it helps.
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post #7 of 12 (permalink) Old 03-31-2019, 10:22 PM
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Quote:
Originally Posted by KiteGX View Post
Nope, it's gas. Sorry for not specifying.


I'm gonna try to clean up the IAC again and see if it helps.

Also put a little oil in the shaft. I carefully push the piston a little to work the oil in. My initial opinion is that it is not OEM unless it has a part # marked some place on it. I will try to look at my 2006 to see if there are any special markings. I believe my 2001s have a Ford part# etched on them.
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post #8 of 12 (permalink) Old 03-31-2019, 11:31 PM
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Nope, it's gas. Sorry for not specifying.


I'm gonna try to clean up the IAC again and see if it helps.
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post #9 of 12 (permalink) Old 04-01-2019, 04:49 PM Thread Starter
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Thanks for letting me know, I added my vehicle information to my userpanel.

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Originally Posted by Automender12345 View Post
Also put a little oil in the shaft. I carefully push the piston a little to work the oil in. My initial opinion is that it is not OEM unless it has a part # marked some place on it. I will try to look at my 2006 to see if there are any special markings. I believe my 2001s have a Ford part# etched on them.
Thanks for sharing that, I'll try it out and see if it performs any better. Mine has a part number etched on it, but it's hard to read.
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post #10 of 12 (permalink) Old 04-01-2019, 07:40 PM Thread Starter
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I cleaned the IAC valve and put some oil on the piston, and I'd say it's a lot better now. The RPM goes up a little with the AC but no dimming, and a single power window barely does anything to the rpm/light dimming. I think it's behaving correctly now. Thanks!
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