why won't my bright lights come on

Asked by Oct 16, 2014 at 12:02 PM about the Chevrolet Silverado 2500HD

Question type: Maintenance & Repair

replaced both bulbs, no power to light switch and no power to the fuses.  when you turn  
dimmer switch on to bright the light indicator comes on dash, the fog lights go off like they
suppose to but no bright lights come on . every other lights come on and work just
fine.could it be the dimmer switch gone out already..2007 chevy silverado HD 2500

7 Answers


Your switch may be bad. The fuses are after the switch.

2 people found this helpful.

I would love to know if you figured this out. I have changed all parts and the symptom still exists.


Jwfishing, Bothe high beams fail to come on? Have you tested to see if there is power coming to the light sockets? If so, the ground or sockets themselves may be corroded or bad. If both lights fail to come on, it may be a disruption before the lights, like a broken wire? Are you sure the bulbs are good? It'd help to know what was replaced, the make and year of vehicle, and if you live in snow and ice country in the winter. Salt corrosion can play havoc with a lot of electronic devices, as does the extreme cold.

Hello John. Thank you for the prompt response. I have changed the headlight switch and the signal \ dimmer switch on the column and the Relay in the fuse box. I have been trying to get a decent schematic to trace all of the wiring. The DRL and the Fog light works as designed. With the fog lights on, they will turn off when the column switch is set to bright. The bright light indicator works on the dash panel. I remove the DRL fuses and the low beams do work from the headlight switch. I am guessing that there is a line break somewhere. The bright bulbs do appear to be good.

I guess I missed the biggest question. 2008 Silverado 1500 LT


If you can, see if when the high beam lights are turned on, there is power at the light bulb connector. If not, than work towards the relay or fuse until you find power. Than you will know from that point to the bulbs, there is a bad wire. Bulbs may look good, but if you have a known working bulb, put it in. Stranger things have occurred.

Much appreciated, just time is all.

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