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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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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

My 97 dodge neon head lights wont turn on but every other light will fuses look ok Wat is my problem


  1. Turn the light switch off and on several times.
  2. Change from high beam to low beam several times.
  3. Use a multi-meter to check for power to the plug that the bulbs connect to. Sometimes there are components other than fuses than can malfunction and stop the flow of electricity.
  4. Change one of the bulbs for a new one. There is a possibility that both headlights are burned out.
Sometimes, the high/low beam switch gets "stuck" between the two settings and the headlights will not come on at all.

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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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Head lamps are burning out one at a time,first low beams then then high beams ending on the left side,smells of burning plastic inside the vehicle.


check voltage of battery while vehicle is running if over 14 volts replace voltage regulator high voltage would cause this problem

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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.

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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...


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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

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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


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2002 grand maquis no head lights


did you check if yourl ow beams. might be burn out that is usually the case if the high beams work that is usually the case if the high beams work take them off buy new ones and try them just make sure you dont touch the new ones with sweaty hands that migh mess them up

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

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