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2005 GMC Sierra 2500HD, left side low and high beams out, new bulbs, fuses good. No power at the sockets. Could this be the high/low switch on the column?

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It shouldn't be the high/low beam switch, as that switches the high/low beam relays. One high beam relay supplies power for both sides, one for low beam, both sides. If you were to lose switch function or a relay, you would lose the high beams or the low beams, but not for just one side. It would be interesting to probe the fuses with a test light and see if you're getting power to and through them. If you are, the problem would be between the fuse box and the headlight, if your not getting power to the left head light fuses, the problem will be in the fuse box. Good luck!

Posted on Nov 12, 2014

  • ddd228 Nov 12, 2014

    Yes,some have a left and a right side fuse!

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Be sure you have a ground AT THE SOCKET.

Posted on Nov 12, 2014

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High/low switch Yes

Posted on Nov 12, 2014

  • boman11
    boman11 Nov 12, 2014

    Several year back, all headlamps were controlled by one power source, so when you lost power you lost both headlamps. That is not true today. There is two circuits coming out of the headlamp switch. One for each side.

  • boman11
    boman11 Nov 12, 2014

    Also, check the wires going into the back of this switch. A lot of time then melt causing a bad connection causing this problem.

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 95 pathfinder only 1 headlight comes on both bulbs good

im a mechanic who owns a1995 pathfinder, had the same problem.your trouble is in your daytime running light module. try giving it a tap, bet they will come back on

Posted on Feb 07, 2009

Molson02536
  • 3854 Answers

SOURCE: 2004 chevy trailblazer low beams not working fuses good bulbs new

Check the relay or your head light switch has gone bad. 

Posted on Apr 06, 2009

  • 260 Answers

SOURCE: Low Beam

Make sure you have a good switch
bulbs good
relay and or fuse is good

Posted on Apr 11, 2009

  • 2 Answers

SOURCE: headlights not working

Ok Guys Thanks I will check into the dimer switch first, But if it is the turn signal switch assembly with the high beam control on it, it will not be cheap, I think they run about 260.00 each.

Thank you for your input.

Posted on May 03, 2009

  • 135 Answers

SOURCE: left side low beam not working

check low beam fuse and relay

Posted on May 19, 2009

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Power flows from the battery to the main fuse. Then it flows to the control coil and contact side of the headlight relay. When you turn on the headlights, the headlight switch provides ground to the control coil in the headlight relay and that operates the contacts. The contacts allow power to flow to the right and left hand headlight fuses. Power flows to the headlights. The headlight switch is what provides ground to the high and low beams on the headlights.

To diagnose, remove the headlight relay. Using a voltmeter, check for battery voltage on terminals 3 & 4 in the socket with the key in the RUN position. Then turn on the low beams. Test for good ground on terminal 1 in the socket. If you're not getting ground, then you've got a problem with either a bad headlight combo switch or a bad ground. If you get good ground on terminal 1, reinstall the relay, turn on the low beams and test for power in the headlight sockets. If you get battery voltage, that confirms you've got good fuses and wiring up to that point. Next, check for good low beam ground on the red/green wire in the bulb socket. If you're not getting good ground, it's either a bad combo switch or bad ground from the combo switch. Then turn on the high beams and check for good ground on the red/yellow wire in the bulb sockets.

It wouldn't hurt to clean the ID ground on the left side of the instrument panel, but based on everything you've said so far, this sounds like a bad combo switch

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