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Why Do Different Bulbs Keep Burning Out? #5337120 01/31/20 09:21 AM
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Gebo Offline OP
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In the last 2 weeks, I have had right rear marker, left front marker, left rear brake bulbs burn out. The only work I have done on my LS400 is about a month ago I had my alternator replaced with a Toyota OEM.

Is this some underlying symptom of a 22 year old car developing old age problem? Should I check anything out ?


'98 LEX LS400 305K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 70K

Shell Gas and Truck 5W-30
QS HM 10W-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Why Do Different Bulbs Keep Burning Out? [Re: Gebo] #5337121 01/31/20 09:28 AM
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supton Offline
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Hook up a voltmeter and monitor while driving. My first thought is, perhaps overcharging, although perhaps it is intermittent. I would think about tacking across the battery (use a fuse if running a wire to your DMM). But maybe I'm wrong and the voltage is high at idle and/or when rev'd up. I'd start by testing at idle, give the throttle a goose and go from there.

You could monitor cig lighter voltage too, that might be enough to monitor while driving.

Alternatively, as you say, it's 22 years old. It's just possible that they all decided to quit at the same time.


2011 Toyota Camry, base, 2.5L/6MT, 203k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 158k, ours
1999 Toyota Camry LE, 2.2L/4AT, 223k, his
Re: Why Do Different Bulbs Keep Burning Out? [Re: Gebo] #5337137 01/31/20 09:41 AM
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CT8 Offline
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Are the bulbs original?


2015 F150 2.7
2018 F350 6.2
Re: Why Do Different Bulbs Keep Burning Out? [Re: CT8] #5337141 01/31/20 09:44 AM
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Gebo Offline OP
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Originally Posted by CT8
Are the bulbs original?


Yes. That’s what has gotten me thinking. Maybe it’s just time. Sorta weird.

2 month old Lexus 84 month battery and 1 month old OEM alternator and new OEM serpentine belt.

Last edited by Gebo; 01/31/20 09:44 AM.

'98 LEX LS400 305K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 70K

Shell Gas and Truck 5W-30
QS HM 10W-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Why Do Different Bulbs Keep Burning Out? [Re: Gebo] #5337144 01/31/20 09:46 AM
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wag123 Offline
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Like I stated in your other thread, you might want to consider replacing ALL of the light bulbs given the fact that you had two of them burn out within such a short time period and they are all the same age. Light bulbs are consumable parts with a limited lifespan, it's time.
At least you got 22 years out of them. I have a bone to pick with Mercedes, they also have a sensitive light bulb failure warning system, but they use light bulbs from a supplier that only last 4 or 5 years, and many of them are extremely difficult to replace.

Last edited by wag123; 01/31/20 09:53 AM.
Re: Why Do Different Bulbs Keep Burning Out? [Re: Gebo] #5337145 01/31/20 09:49 AM
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madRiver Offline
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If you have time on your hands chase it.

I think 3x/year per same $5 bulb then I would give it some more thought and analysis. 22 year car is be happy it works!

Re: Why Do Different Bulbs Keep Burning Out? [Re: Gebo] #5337161 01/31/20 10:11 AM
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ragtoplvr Offline
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Your alternator may be overcharging and or your battery is weak and unable to correctly filter the spikes add or bad ground wires. Also some alternators use avalanche diodes, and some of the cheap china replacement units use regulator diodes. Avalanche diodes limit voltage spikes.

Some cheap regulators do not have effective voltage control, slow to respond, oscillate (sometimes with non led lights you can see them pulsing) overshoot etc. I would check voltage while driving. A cheap needle voltmeter from harbor freight is under $10.00. needle is better in this case than digital since you can see the needle wiggle when a LCD digital display never shows anything.

Rod

Re: Why Do Different Bulbs Keep Burning Out? [Re: madRiver] #5337167 01/31/20 10:18 AM
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Gebo Offline OP
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Originally Posted by madRiver
If you have time on your hands chase it.

I think 3x/year per same $5 bulb then I would give it some more thought and analysis. 22 year car is be happy it works!



I'm afraid you are making sense. I have time to chase it but I don't feel like it. I'm gonna give it another week or two.

The one bulb that we may have initially missed was the lower left brake light. The story can get complicated so I'll just stop here.


'98 LEX LS400 305K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 70K

Shell Gas and Truck 5W-30
QS HM 10W-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Why Do Different Bulbs Keep Burning Out? [Re: wag123] #5337169 01/31/20 10:22 AM
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Gebo Offline OP
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Originally Posted by wag123
Like I stated in your other thread, you might want to consider replacing ALL of the light bulbs given the fact that you had two of them burn out within such a short time period and they are all the same age. Light bulbs are consumable parts with a limited lifespan, it's time.
At least you got 22 years out of them. I have a bone to pick with Mercedes, they also have a sensitive light bulb failure warning system, but they use light bulbs from a supplier that only last 4 or 5 years, and many of them are extremely difficult to replace.


IF one more blows out, I will go to Lexus and buy all the exterior bulbs.


'98 LEX LS400 305K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 70K

Shell Gas and Truck 5W-30
QS HM 10W-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Why Do Different Bulbs Keep Burning Out? [Re: Gebo] #5337180 01/31/20 10:34 AM
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Donald Online Content
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bad karma


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Why Do Different Bulbs Keep Burning Out? [Re: Gebo] #5337188 01/31/20 10:46 AM
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JustinH Offline
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305k and original bulbs? Good run I'd say.

I am of the opinion that Toyota has excellent electrical control. I had to never replace a tail light in my Scion XB, Corolla, or Matrix.

My 16 Ford already needed tail/brake bulb replacement at 30k.


'16 Ford Escape
'11 Scion XB
Re: Why Do Different Bulbs Keep Burning Out? [Re: Gebo] #5337232 01/31/20 11:27 AM
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JimPghPA Offline
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If the new alternator is putting out too high of a voltage the bulbs will not last long.

Have someone with a background in electronics rig up a connector that plugs into your 12 volt receptacle (the round one that looks like what older cars plugged the cigarette lighter use to plug into) so the rigged plug provides wires to connect to a digital volt meter they can lend you, and monitor the voltage while the vehicle is being driven. Record the highest voltage, (some digital volt meters will save the highest reading) and do a little research to see if that value is too high.

The problems started after you replaced the alternator, so the new alternator is most likely the problem and is putting out too high of a voltage.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Why Do Different Bulbs Keep Burning Out? [Re: Gebo] #5337251 01/31/20 11:42 AM
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Drive it for a couple of weeks, and see if the trend of burning the bulb continue with the NEW bulb.
If the same bulb went bad in the span of time you mention, then the alt may be the issue.
I am assuming it is different ORIGINAL bulb that is more than its intended life cycle.

It is not a trend yet.


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: Why Do Different Bulbs Keep Burning Out? [Re: Gebo] #5337264 01/31/20 11:52 AM
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Gebo Offline OP
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Three different original bulbs.


'98 LEX LS400 305K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 70K

Shell Gas and Truck 5W-30
QS HM 10W-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Why Do Different Bulbs Keep Burning Out? [Re: Gebo] #5337305 01/31/20 12:31 PM
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Lolvoguy Online Shocked
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Regardless of the mileage/age of the car, I agree that it's related to the alt replacement.
After confirming the output of the alternator, I'd check (clean and seal) the grounds for the alternator and battery etc.


06 Lexus IS350- Wife
88 BMW 325is- Mistress
Say "no" to Turbo!
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