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Why does my high beam head light wirer melt over time takes about a month and causes the high beam head light to burn the connection to the light on a 2005 buick lacrosse

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  • Buick Master
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Resistance in the electrical circuit . Using voltage drop testing is the way to find this type problem .
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

Do you own a DVOM - digital volt ohm meter ? Know how to use one ? Do you know what a wire diagram is an how to read an use one to pin point places in a wiring harness to do circuit testing ?
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
Free wiring diagrams http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click on lighting , then under subsystem click on HeadLamps . Click the search button then on the blue link.
The lamp switch is a input to the BCM , the BCM energizes the high beam relay . With a amp meter jumped into where the relay plugs into , pin's 30 & 87 ,check current flow . If you look on the bottom of the relay you will see numbers 30 & 87 this is the load side of the circuit . Numbers 85 & 86 are the control side . The high beam relay is located in the under hood fuse / relay box. #34 Do you know what a relay is a how they work ?
VEHICLE RELAYS Testing from the relay base They use relay's for all kind of thing's , horns , light's , power to ignition circuits etc...

VEHICLE RELAYS Operation Diagnosis

Posted on May 14, 2017

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  • Buick Master
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There are two reasons I can think of why the headlamp connector is melting. Clearly it is getting too hot. The materials used should be able to withstand the heat from a standard headlamp bulb.

Either too much current is flowing due to the incorrect wattage of bulb being fitted or perhaps the bulb is defective in some way.

Perhaps the connection isn't very good. If the connection between the wire and the terminal or the terminal and the bulb is dirty or loose it will provide an electrical resistance and when lots of current flows it will generate heat. If the connection is loose or a spring-loaded construction designed to be easily fitted or removed and is subject to vibration or sometimes temperature changes, there can be a small amount of arcing which also generates heat.

Posted on May 14, 2017

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Posted on Jan 02, 2017

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1 Answer

Each time I replace the H4 bulbs on the corolla,the low beam lights always get burnt but for high beam I have no problem so am only on high beam.I have replaced more than 20.what can be the problem


indicates loose ground wires for the low beams .
loose/ dirty connections cause arcing and that cause over voltage and that burns the light filaments in your case low beams
check the fitting on the bulbs , relays and ground points

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Auxbeam led bulbs burning out


Wear gloves when changing the bulbs. Your body oils will cause the bulbs to burn extremely hot and burn out. Check your tail lights. Some vehicle's interior light goes out of stays on when your tail lights malfunction.

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Neither headlights working or fog lights any ideas please


First check for blown fuses (a blown fuse indicates there is a short in the lighting circuit ) and check any defective relays. When vehicles are operated with the fog lights on all the time this causes the wiring for the associated circuit(s) to operate at a higher temperature and eventually it will result in a burned out non-conductive connection. Usually the wire(s) burn out where they are connected to switches, at the headlamps, fog lamps etc... Also check for a burned out connection or a melted terminal contact board used for the high beam-low beam switch which is usually located inside the steering column.
Good luck.

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Only one head light works at a time, diferent light in all positions


Most likely the high beam filament is burnt out on your left light, and the low beam filament is burnt out on your right light. My first recommendation would be to purchase a couple of headlamp bulbs, install them and see how they work, then post back if you are still having an issue

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I have no low beam headlights. The high beams work and I have changed the switch and bulbs and checked the fuses. what next


Check the connectors that go to the headlight bulbs to see if they are burned or melted. Low beam lights are on longer than high beams. The heat buildup around the connectors normally melts them.

Sep 27, 2010 | 2005 Chevrolet Trailblazer Ext

2 Answers

2005 impala lowbeams do not work at all. high beams, turn signals, and taillights are fine. i cut the negative and grounded it on the car and now the headlights are on but will not shut off unless i take...


ok put the ground back were you cut it and remove bezel near head light switch test powers in and out with 12 volt test light on low beam and high beam you may just have a bad head light switch make sure you have headlight power coming out of the swicth for low beams.

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1 Answer

2003 hyundai elantra low beams not working but the high beams and parking lights are, why, help


its kind of uncommon but I have seen both Low Beams burn out at the same time,but first check to see if your vehicle has a separate relay for the high beams and one for the low beams if so replace the low beam one if that is not replace both head lights,and it that is not it the only thing left is the head light switch itself.Hope this helps good luck

Jan 01, 2010 | 2003 Honda Pilot

1 Answer

My 87 k5 blazer headlights don't turn on when the car is started and running any more... all 4 headlights turn on fine when I pull the lever all the way out for high beams


The vehicle should not have to be running for head lights to burn.If high beams work,then the low beam head lights could be burned out,even though they light up with high beams.The dimmer switch,can be the problem if the head lights only work on high beam.

Dec 12, 2009 | 1987 Chevrolet Blazer

1 Answer

Regular head lights do not work but high beam works


most likely it is indeed a fuse problem...they will be located under the steering column.

Mar 30, 2009 | 2005 Toyota Corolla

4 Answers

Low beam headlights do not work, but high beam headlights do


Clyde,

I've been troubleshooting this same problem on a different vehicle this week, and I can give you the steps I'd take.

1. If both sides went out at the same time, the problem is *NOT* likely to be the bulbs.

2. Check the fuses to see if both low beam lights are on the same fuse. Many cars have one fuse for low beam and another for high beam, so both lights out at the same time typically means fuse blown.

3. If the headlights are OK and the fuses are OK, then the problem is *LIKELY* the headlight switch. In my case, AutoZone has one and it can be installed easily; but in your case, that may not be as simple.

Please post your findings or comments.

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