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Because the power for your headlights is pulled from your battery. When the dashboard lights dim after turning on the headlights the dashboard lights aren't getting as much power as they were with the headlights off.
With the motor running or off?
The headlights draw a lot of current, but should not visibly affect other systems.
There could be a problem with a worn out battery, an alternator that isn't charging correctly, or you have a bad earth between the battery and the chassis.
Check the large cable connection between the battery (usually negative these days) and the bodywork, or between the engine block and the bodywork.
What else can I help you with?
How do you turn on automatic headlights 1999 Tahoe?
For the 1999 Chevy Tahoe, automatic headlights are turned on by default. Turning them off requires opening the bezel on the dashboard and removing the light sensor.
How do you replace the illumination light for the headlights on the dashboard?
test
What does the light bulb on the dashboard of a Mercedes c280 mean?
the light bulb on you dashboard means you have and exterior light out if it isn't you headlights blinkers....ect its probably just a short
Which light on the dashboard means you have a headlight out?
On most vehicles there is no such light. Turn on your headlights and look see if one is out.
Why does your dashboard light cut off when you turn on your headlights?
Try rolling the dimmer dial upwards , just right of the headlight toggle, just short of turning on your interior dome light. Otherwise it's a short somewhere. jr
What causes the abs dashboard light to appear in a 2001 expedition?
light sensor
What causes your park brake light and battery light to blink?
The button on your dashboard
When turning on the headlights in a 2001 Honda civic the dashboard light does not come on do i need to replace bulb?
Before checking fuses, check that operator error hasn't turned off panel lights at the dimmer. Check owners manual.
What causes the dashboard lights to stay on after car is turned off?
What causes the dashboard light to stay on after your car has been turned off? 1994 Buick Century.
When i 2005 escape you turned on headlights and radio lights went out turned off headlights lights came back on radio?
If you turn up your interior dashboard light settings, then the radio display will be brighter too. The radio dims to the setting for the dashboard when the lights are turned on.
How do you turn on dash board lights?
To turn on dashboard lights, locate the dashboard light dimmer control, usually found on the headlight switch or as a separate knob or dial. Rotate or press this control to adjust the brightness of the dashboard lights. If your vehicle has an automatic setting, ensure that the headlights are turned on, as dashboard lights may only illuminate with the headlights activated. If the lights still do not work, check the vehicle’s fuse for the dashboard lighting circuit.
What is the button for in the right dashboard speaker in a Chevy blazer 2000?
That is not a button, but a light detector. When it gets dark enough, the headlights automatically come on.
