Lights Dim When Changing Gears? - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 18 (permalink) Old 02-17-2006, 06:07 PM Thread Starter
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Hey all,
I've been away for a while, but I am back. Over the last couple of months as I hit high revs and the car is shifting I have noticed that all my lights (headlights, dash, radio) start to dim. It's most noticable when I'm running WOT just before the red to switch I will see the lights dim at about 4.5-5K rpms. Once the car has shifted gears everything goes bright again. Any ideas?

Just as a note I replaced my Battery with the Zone - Gold last year running 2 guage to the battery and 4 to the grounds.

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post #2 of 18 (permalink) Old 02-17-2006, 06:30 PM
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Alternator might be on it's way out??

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post #3 of 18 (permalink) Old 02-17-2006, 06:55 PM
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Yes it sounds like the brushes have about had it.

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post #4 of 18 (permalink) Old 02-17-2006, 07:03 PM
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Sounds like its Alternator related. Take teh alternator to an auto parts store. I think they might test it for free if not it should be under 5 bucks.

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post #5 of 18 (permalink) Old 02-21-2006, 12:39 AM Thread Starter
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Okay that was my thought too. Just seems wierd that it only did it on the high revs. I've been wanting to replace that anyway.. Time for upgrade!

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post #6 of 18 (permalink) Old 02-21-2006, 09:42 AM
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if its not the brushes of the alt its most likely the alternator its self, the brushes have been worn down completely and gouged the copper elemnt in the alternator

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post #7 of 18 (permalink) Old 02-21-2006, 01:23 PM
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and make sure the battery is charged when new alt. is installed. quite a few new alts. are killed when they are first used to charge a dead battery (most even have this warning on the alt them selves)

Just got a 93 ranger, 5 speed, vulcan powered

which in a way could be a taurus with a pickup bed.
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post #8 of 18 (permalink) Old 06-08-2006, 08:05 PM Thread Starter
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Hey guys I just had the Alternator tested and they said it's running good. They used a tester which connects to the battery terminals. I don't know if that makes a difference. Would I be able to tell from looking at the Alternator if the brushes are bad?

Also the battery I have is about 1year old Duralast Gold. I have gold plated connectors and 2Guage Custom wiring that I did myself going to the grounds and positive. It test out good and of course I keep it clean..

Is it possible that something else is causing this problem?

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post #9 of 18 (permalink) Old 06-08-2006, 08:24 PM
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The alternator may be good at low RPM but when you rev the engine up it looses efficiency. I've personally had 3 alternaotrs in various vehicles go out or show signs of being wheak inder high rpm's. On my Volvo it died while approaching 6k rpm's and a quick swap out of the brush pack / voltage regulator unit solved that problem.

Another one was my Dad's nissan truck, at 4.5k the battery light would come on. Took it to nissan and they replaced the alt under warranty.

My volvo started out like yours and the battery light would come on during high rpm's, but after a shift would go out. I didn't feel like fixing it till it died, it ended up going out 2 weeks later.


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post #10 of 18 (permalink) Old 06-11-2006, 04:14 AM Thread Starter
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Well my wife's car is apparently suffering from the same situation. Mine has been doing this for a little over a year now. Just lost one of my new Silverstars most likely to this problem so hopefully by next weekend we will have 2 set's of brushes and voltage regulators.

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