Question about 2004 GMC Sierra

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Headlights never turn off when running. p.brake will not turn off

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Are the dash lights on as well? if they are, there is a problem with the ambient light sensor (armor all'ing the dash can damage the sensor). if they are not on, its just the daytime running lights. they will only be off if you set the e brake BEFORE you start the truck. once the ebrake is back off, the lights will stay on.

Posted on Nov 17, 2009

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How to find an electrical disturbance in 1998 ford expedition


Normally this condition is the result of a poor body ground connection. Testing for this can be deceiving. At the static(nothing on) condition, testing can show a good ground. However when a circuit is excited, it has a determined resistance and a set current flow. If the ground connection to this or a branch circuit is loose, corroded, or broken wire. This will allow just enough connection to show as being good, but not good enough to complete the circuit with the required amount of connection when energized.

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No brake light no running lights no dash lights if u play with the headlight switch u can get every thing to work but brake lights but when u press the brake it turns your headlights off


Hi,
I'll make it brief( something wrong w/ my ISP ).
You got problem in the light switch assembly, the plastic cam is already melted and failed to push the metal contactors to the contact points. Replace is necessary.
The brake and headlight problem, better check the shorted wire in the relay and fuse box in the engine area, there is a shorted wire that stealing the power of the headlight relay, thus it turns off when you step on brakes.

Recommendation: Better have a tech to check on that, a total check up of the lighting and brake light harness is required, the main harness under your steering must be check thoroughly.

Hope that helps!

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Can headlights be turned off during day?


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1 Answer

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When I turn my headlights on at night, all of the


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