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Thread: Battery Light On - Flickers at High RPM

  1. #1

    Default Battery Light On - Flickers at High RPM

    Hello,
    I had my clutch replaced at a local shop, I've always liked their service and price and never had issues with them. When they replaced my clutch last year the battery light came on. They tested the alternator and battery, all fine. Car runs fine, and they checked for any ground cables that weren't connected or loose and found nothing. Car runs and starts fine. Sometimes stalls at low speeds, but I think that's just me needing to adjust my Pro Flow maf with the plug in tool.

    When the car is on it's solid red, when I get to 5,000-6,000 rpms it flickers and disappears. then flickers and comes back on solid when it goes below those rpm's. Any idea's on the issue?
    Robert Knauber - rknauber@yahoo.com
    2005 G35x - 2010 Rav4 - 2003 Katana 600 - 1988 Hurricane 1000

  2. #2

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    "Floating" brushes. Alternator may be on its way out. Do the battery and alternator test in the M&M how to.
    http://www.contour.org/ceg-vb/forumdisplay.php?f=56

  3. #3

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    Everyone on ceg has had that issue lol Most likely it's the alternator, but there's always a slight chance it could be a loose belt or something, I dunno. I changed my alternator, battery, and serpentine belt, and it fixed the problem temporarily but then it came back a few weeks later.

  4. #4
    Join Date
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    Quote Originally Posted by Tony2005 View Post
    "Floating" brushes. Alternator may be on its way out. Do the battery and alternator test in the M&M how to.
    http://www.contour.org/ceg-vb/forumdisplay.php?f=56

    if I am not mistake this sounds the opposite of that ... isn't the floating brushes a flickering alternator light at high rpm? The high rotational speed of the alternator would cause the brushes to float not low rpm. So that would be a flickering light at high rpm and off at low since the floating causes the alternator to stop charging. The problem was discribed as on constant at idle the flickering and off at high rpm ... I am thinking that the refernece wire could be the problem.

    I would follow the pin point tests from ford to test for why the light is on.
    - 12 Focus SE
    - 95 Mystique LS <-sold
    - 99 Contour SE Sport <- traded in 2/13
    - 99 Contour SeVT <- 3L/NPG Turbo
    - 2k Contour SVT - #2137

  5. #5
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    make sure battery terminals r clean and tight also.
    98 Mercury Mystique LS 2.5L MTX 141k
    88 Katana 600cc 5200k

  6. #6

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    Quote Originally Posted by BrApple View Post
    if I am not mistake this sounds the opposite of that ... isn't the floating brushes a flickering alternator light at high rpm? The high rotational speed of the alternator would cause the brushes to float not low rpm. So that would be a flickering light at high rpm and off at low since the floating causes the alternator to stop charging. The problem was discribed as on constant at idle the flickering and off at high rpm ... I am thinking that the refernece wire could be the problem.

    I would follow the pin point tests from ford to test for why the light is on.
    You are correct on that. One always at idle and flickers at high RPM. Where are the pin point tests from ford? I've been out of the contour loop for quite some time and don't know what this is.

    Oh and what's the reference wire?
    Robert Knauber - rknauber@yahoo.com
    2005 G35x - 2010 Rav4 - 2003 Katana 600 - 1988 Hurricane 1000

  7. #7

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    Quote Originally Posted by jd2-98s View Post
    make sure battery terminals r clean and tight also.
    Thanks for the reminder on this one, gotta break out my terminal cleaner and anti corrosion goop (Electro-somethingorother).
    Robert Knauber - rknauber@yahoo.com
    2005 G35x - 2010 Rav4 - 2003 Katana 600 - 1988 Hurricane 1000

  8. #8
    Join Date
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    Quote Originally Posted by Knauberized View Post
    You are correct on that. One always at idle and flickers at high RPM. Where are the pin point tests from ford? I've been out of the contour loop for quite some time and don't know what this is.

    Oh and what's the reference wire?

    the reference wire is the wire that runs from the under hood fuse box to the voltage regulator so the alternator knows what voltage to put out ... best bet is to get a shop manual as it will have the pin point tests ... you can get the service cd from todas for a few dollars
    - 12 Focus SE
    - 95 Mystique LS <-sold
    - 99 Contour SE Sport <- traded in 2/13
    - 99 Contour SeVT <- 3L/NPG Turbo
    - 2k Contour SVT - #2137

  9. #9

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    this sounds similar to my problem. when it first happened, i was on the highway heading back home. the light dimly light up then kind of flickered on and went away. it did this several times at 60mph. then it did a bunch of flickering while going through the gears. after about 20 miles, the light stayed on full for 2 minutes and went away. from there it dimly light up at low rpms then went away at high rpms. so i figured when i got up to 70mph all would be fine. pretty much was, flickered a few times.

    then i get a mile from my house and notice low rpms it wouldnt come on. i get around 2500 rpms, and light barely comes on and steadily got pretty as the rpms went up. now today i go to get it tested and light was on constantly after i started till i hit 20mph and didnt come back on. i drive 15 miles, and nothing. have it tested and light was barely on, then when the load hit, battery light was light up. test showed no signal from alternator. i decide to pick up an alternator since im in a pinch and have to drive 250 miles tonight.

    does that sound like the typical alternator problem? but after this, im about to sell the car. i cant keep spending money on a daily driver that is far from reliable.
    1997 Saturn SL2-project car (salvaged now, current tear down)
    1996 Ford Contour-DD, up and running again

    STC-OH member

    My SL2 and other cars

  10. #10

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    Quote Originally Posted by saturnspeed_12 View Post
    ...does that sound like the typical alternator problem? ....
    Yes. Or the infamous Goldentour alternator wiring fix issue.

    From Duratec Maintenance-Read First
    http://www.contour.org/ceg-vb/showthread.php?t=41
    Last edited by Tony2005; 03-28-2007 at 05:06 AM.

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