Headlights Dim When Braking RX 300 2000
#1
Driver School Candidate
Thread Starter
Headlights Dim When Braking RX 300 2000
I have noticed recently that my headlights dim for a split second as soon as I hit the brakes then they go back to normal.
I sanded the paint down to bare metal, applied a little dielectric grease and reinstalled the ground wires. also battery terminals. Check Batt and charging 13vdc all ok...
Any one else has this problem? any ideas on fixing it?
Should I install LED lamps? less current draw.
thank you in advance
I sanded the paint down to bare metal, applied a little dielectric grease and reinstalled the ground wires. also battery terminals. Check Batt and charging 13vdc all ok...
Any one else has this problem? any ideas on fixing it?
Should I install LED lamps? less current draw.
thank you in advance
Last edited by FilPilot; 12-16-12 at 04:42 PM.
#3
Moderator
I have noticed recently that my headlights dim for a split second as soon as I hit the brakes then they go back to normal.
I sanded the paint down to bare metal, applied a little dielectric grease and reinstalled the ground wires. also battery terminals. Check Batt and charging 13vdc all ok...
Any one else has this problem? any ideas on fixing it?
Should I install LED lamps? less current draw.
thank you in advance
I sanded the paint down to bare metal, applied a little dielectric grease and reinstalled the ground wires. also battery terminals. Check Batt and charging 13vdc all ok...
Any one else has this problem? any ideas on fixing it?
Should I install LED lamps? less current draw.
thank you in advance
Salim
#4
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Join Date: Dec 2010
Location: Oregon
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I noticed that recently on my 2001. I also noticed that the lights were flickering at a steady rpm. I put a voltmeter on the battery and the voltage was jumping up and down between 13.8 and 14.7. Sounds like alternator time soon......
#5
Driver School Candidate
Thread Starter
Tested the system today on the way home from work. it would seem that the headlights are not dimming anymore
Also would like to mention that..I cleaned both terminals and added some Magnesium Sulfate (epsom salt) with distiled water to the battery and charged it for about 2 hours at 40 amps.
Thank everyone for the input. I will keep an eye out for the alternator/battery and update this thread if anything changes.
Also would like to mention that..I cleaned both terminals and added some Magnesium Sulfate (epsom salt) with distiled water to the battery and charged it for about 2 hours at 40 amps.
Thank everyone for the input. I will keep an eye out for the alternator/battery and update this thread if anything changes.
#6
Driver School Candidate
Thread Starter
OK no more dimming / flickering of the headlights, however now after starting vehicle and turning the overhead light on, it flickers. Maybe as some folks have mentioned the alternator/regulator fluctuating means it is starting to go
#7
Moderator
Tested the system today on the way home from work. it would seem that the headlights are not dimming anymore
Also would like to mention that..I cleaned both terminals and added some Magnesium Sulfate (epsom salt) with distiled water to the battery and charged it for about 2 hours at 40 amps.
Thank everyone for the input. I will keep an eye out for the alternator/battery and update this thread if anything changes.
Also would like to mention that..I cleaned both terminals and added some Magnesium Sulfate (epsom salt) with distiled water to the battery and charged it for about 2 hours at 40 amps.
Thank everyone for the input. I will keep an eye out for the alternator/battery and update this thread if anything changes.
Salim
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#9
Moderator
Dont believe everything you read on the internet! Some of it can be disastrous with serious and permanent disfigurement (acid burn in this case).
Suffice is to state that if you charger shows more than 5 Amps after 30 seconds disconnect and take your battery to a professional. (12Vx40Amps= 480Watts .. which can boil the electrolyte)
Maybe a chemistry major can fill this out ..
H2SO4 + Epsom Salt + H2 + O2 --- heat + emf --> ??
Till that time nothing should go down in the battery other than H2O. [This is what is specified by battery manufacturers]
Salim
Suffice is to state that if you charger shows more than 5 Amps after 30 seconds disconnect and take your battery to a professional. (12Vx40Amps= 480Watts .. which can boil the electrolyte)
Maybe a chemistry major can fill this out ..
H2SO4 + Epsom Salt + H2 + O2 --- heat + emf --> ??
Till that time nothing should go down in the battery other than H2O. [This is what is specified by battery manufacturers]
Salim
#10
Driver School Candidate
Thread Starter
Just an update all is well, temps in Virginia have dropped down to 20s battery is holding up and the car starts up well. lights still show some dimming. when applying brake lights.
#11
Driver School Candidate
Thread Starter
Just an update. I am still experiencing the same dimming problem. since last post.
New battery, same alternator.
Has anyone installed a large cap so as to stabilize the current spikes?
New battery, same alternator.
Has anyone installed a large cap so as to stabilize the current spikes?
#13
Mine has being doing this for years... More noticeably, the interior overhead lights when you open the door do it as well at night. Must just be alternator on it's way... ugh whatever...
#14
Moderator
In pursuit of perfection ....
Dimming is normal. The sources (alternator and battery) and wires are non-ideal and when substantial load is dumped on, there will be less juice for the headlights.
Salim
Dimming is normal. The sources (alternator and battery) and wires are non-ideal and when substantial load is dumped on, there will be less juice for the headlights.
Salim
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