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Old 11-03-2020, 03:34 AM #1
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Headlights “blink”

So, curious if anyone has the same issue or a solution. When I am driving with lights on at night I get a “blink” or reduction in light intensity when I apply the brakes. It seems as though the truck does not have quite enough power to give to both the brake lights and headlights at the same time.
I have done the H9 bulb swap, so there is a little more draw from the headlights, but should be negligible right?
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Old 11-03-2020, 09:42 AM #2
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I had this happen when my battery was really low/ on its last leg. After replacement it seems to have gone away. Check your battery health?
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Old 11-03-2020, 12:45 PM #3
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Quote:
Originally Posted by ScottR View Post
I had this happen when my battery was really low/ on its last leg. After replacement it seems to have gone away. Check your battery health?
Also check the alternator voltage. Should be about 14 volts with the engine running and over 12 volts when the engine is off.
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Old 11-03-2020, 10:38 PM #4
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Thanks guys, I will check both. Truck seems to crank and start with no issues, but the battery is the original Panasonic from 2015.
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Old 11-03-2020, 11:02 PM #5
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Quote:
Originally Posted by fkheath View Post
Also check the alternator voltage. Should be about 14 volts with the engine running and over 12 volts when the engine is off.
Explain to me how you check the voltage output of an alternator with the engine off?
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Old 11-03-2020, 11:18 PM #6
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Explain to me how you check the voltage output of an alternator with the engine off?
I was going to say that, but then I figured it would be too snarky.

The OP needs to return his car to stock to see if his problem goes away.
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Old 11-03-2020, 11:21 PM #7
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I was going to say that, but then I figured it would be too snarky.

The OP needs to return his car to stock to see if his problem goes away.
LOL, funny stuff. I know what he was trying to say, alternator with car on, battery with car off.
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Old 11-03-2020, 11:31 PM #8
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Nah, not trying to be snarky at all. I was just being direct and making sure there wasn't something I was missing.
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Old 11-04-2020, 01:37 AM #9
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I have this exact issue too. I have also done the h9 swap but have a pretty new odyssey group 34r with a voltage booster. So my alternator voltage is plenty high. Voltage doesn’t seem to be the issue.

I don’t remember having this issue with stock configuration but I can’t say for sure it wasn’t an issue. I just may not have noticed.
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Old 11-04-2020, 10:08 AM #10
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Same here, thought I was just seeing things with nose dive when braking and shadows playing tricks on me. Also have done the h9 swap, but all other electrical is stock. Original battery, almost three years old now.
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Old 11-04-2020, 09:44 PM #11
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So, I am going to temporarily put the H11 bulbs back in and see if the problem persists. Easy way to check to see if the H9 is the culprit.
Will check back later.
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2015 T4R Trail Red, 3” lift, 285s, Niserack, HF rock sliders, BA bumper
2006 4runner sport, v6, Tacoma TRD springs front, airbags And 2” spacers in rear. 440k and still chuggin along.
1977 FJ40, V8, lifted, Warn 8274 winch etc.
2006 GX470, 285s, 2” lift, C4lo sliders
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