Aux Lamps

Hooba · August 7, 2006

Hey guys,

I have a 2004 2500HD Chevy. It's got a button to the left of the passenger airbag switch labled 'Aux Lamps'. I've looked through the manual but havn't found what this controls.

I do not have the clearance lamps either....

Thoughts??

Also, what's the easiest way to tell what motor I have? I'm 95% sure I have a 6.0 but I guess it could be an 8.1. This is a company truck that I just got....

Hooba · August 7, 2006

11 veiws and no one know?! Here is a picture of the button if that helps....

Thanks!!

Frozen001 · August 7, 2006

First: Did you buy it new or used??

Second when you push it do you hear a relay?? Normally that button controll the relay that is used for roof mounted beacons...

cmadz71 · August 7, 2006

This "AUX LIGHT" switch is commonly part of the snow plow prep package that can be ordered on these trucks. Like mentioned, the switch activates a relay that can control roof beacon or strobes. Make sure that it is off even if nothing is connected to it. I believe that it is not controlled by the ignition switch. I believe that it has constant 12 volts to it and if left on, it will drain the battery. I could be wrong.

To identify the engine, lift the hood and there should be a white label on the radiator support or radiator shroud. This white label should specify engine size, belt routing, spark plug gap, etc.

Hooba · August 7, 2006

First: Did you buy it new or used??

Second when you push it do you hear a relay?? Normally that button controll the relay that is used for roof mounted beacons...

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I imagine the company bought (leased) it new. I'm just the one driving it now though.

No, I don't hear a relay.

Hooba · August 7, 2006

This "AUX LIGHT" switch is commonly part of the snow plow prep package that can be ordered on these trucks. Like mentioned, the switch activates a relay that can control roof beacon or strobes. Make sure that it is off even if nothing is connected to it. I believe that it is not controlled by the ignition switch. I believe that it has constant 12 volts to it and if left on, it will drain the battery. I could be wrong.

To identify the engine, lift the hood and there should be a white label on the radiator support or radiator shroud. This white label should specify engine size, belt routing, spark plug gap, etc.

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AH, that makes sense. I don't belive it's hooked up to anything, but the LED does come on when it's pushed. The truck doesn't have a snow plow, but must have the kit for it.

Thanks for the help!

Jimmy J · August 7, 2006

My rig has the snowplow prep package, but no plow. Same button... it is live, so make sure the LED is off if not being utilized.

sonjaab · August 8, 2006

The button is the on/off switch for a roof beacon. The wires

are deadheaded above the headliner...............The relay is

in the left rear B pillar near the shoulder belt anchor bolt.

ALL VYU snowplow prep. GM trucks will have this button !

Frozen001 · August 8, 2006

The only reason I think it might be for something different is that is is labeled Aux Lights.... my 2004 GMC 2500hd has a little picture od a truck cab and a light on it rather than AUX LIGHTS....unless Chev's use that button and GMC uses a different one. Look in the glove box for the RPO codes and see if there is a VYU code on the list...

Trouttrooper · August 8, 2006

6.0 engine tachometer will not have a redline marked on it. The 8.1 does.

ctfan · August 9, 2006

The only reason I think it might be for something different is that is is labeled Aux Lights.... my 2004 GMC 2500hd has a little picture od a truck cab and a light on it rather than AUX LIGHTS....unless Chev's use that button and GMC uses a different one. Look in the glove box for the RPO codes and see if there is a VYU code on the list...

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In 03 they changed it from say AUX Lights to the symbol showing a truck with a little light on top. I guess to indicate that it is for a beacon.

Will

Frozen001 · August 9, 2006

In 03 they changed it from say AUX Lights to the symbol showing a truck with a little light on top. I guess to indicate that it is for a beacon.

Will

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Right... and he said he has a 2004....so the only way to tell if it is factory is to see if he has RPO code VYU

sonjaab · August 9, 2006

For full VYU plow prep. option info. check out:

http://www.gmupfitter.com/publicat/bull/bull27.pdf

Hooba · August 9, 2006

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Right... and he said he has a 2004....so the only way to tell if it is factory is to see if he has RPO code VYU

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There is no VYU code in the glovebox....

I know it's never had a snow plow on it.

ctfan · August 9, 2006

In 03 they changed it from say AUX Lights to the symbol showing a truck with a little light on top. I guess to indicate that it is for a beacon.

Will

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Right... and he said he has a 2004....so the only way to tell if it is factory is to see if he has RPO code VYU

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Whoops!! My bad, I guess I missed that. I have no clue what that would be for if ya dont have the Plow prep package listed in your RPO sheet. Only thing I can guess is that it was added by the dealer for something.

Will