Ranch55

Posted 05 March 2015 - 09:45 PM These are my before and after photos ...... I do not believe the upgrade is as bright as my 2005 GMC, BUT it is much, much better. I can now see the shoulders of the highway and I can see much farther down the highway. I do believe the lighting is AT LEAST 30% better, but probably much more. I think I am willing to drive my new truck in the dark now. I can even see the dark ranch road to turn into the ranch now, whereas before I could not. The first two photos are the before photos. The next two are the after TSB photos. And the last one photo is the OEM headlights with Sylvannia Silverstar Ultra bulbs on my 2005 GMC 2500 HD. Edited by Ranch55, 05 March 2015 - 09:56 PM.

Posted 05 March 2015 - 07:08 PM These are the actual Vosla bulbs and AC Delco / GM Part numbers installed in my truck today at my service department. We had a big arctic front blow through here last night and everything cleared out today. Big blue sky, but windy and cold as ****. So, tonight I should be able to check the upgrade out and be able to take my comparison photo with the TSB update ........

Go back and start with posts about 500 to 550 or so ..........

As jamin87ss posted above, the bulbs are not fully seated. If you read all the useful information in this thread, it would have told you that. Go back to about post 500 to 550 and you will find all the detailed information ...........

Same issue happened to my truck after the BCM flash....... Took my truck back in to service dealer and they had to reflash the BCM to correct the temp. sensor output ..... All working okay now.

You will be ...........

I haven't found anything yet on the Helm shop / service repair manuals for the GMC Sierra 2500 HD and the 3500 HD as of yet. I always get these "factory OEM" manuals when I buy a new truck .......

One or both bulbs are not fully seated in the mounting holes. Both must be fully turned and seated or you will see unlighted spots. Fully seating the bulbs can be difficult but must turn them until you can definitely feel the stops ......

Right. I don't think location has much to do with it. My truck was one of the first, if not the first in Texas to have the upgrade done. I was one (of several folks) who had been pursueing the inadequate headlight issue with my dealer and GMC customer assistance. I had a case number assigned to me. My dealer had the new Vosla bulbs, GM part # 23342527, ordered for my truck before the actual PIT5374 document was widely distributed ..... Now, that being said, I have since been able to order some more of the Vosla bulbs, with the GM part #, so I can have some spare bulbs on hand. I always keep spare headlight bulbs on hand because of the very rural, 60 miles from town, country where I live. It only took about 3~4 days for the spare bulbs to arrive......

I'm having difficulty understanding why some service and parts departments are saying they are having a hard time getting the new Vosla bulbs. I am now seeing more places online to order the GM part #23342527. I have just received two (to have spares on hand) that I ordered online from a GM dealer and received them in about four days. So...... what gives ?????? Beats me .........

I don't think any documents are going to help you either. It's apparent that we can't help you. You just want to whine and then dump on those of us who have gone through the proper process, and are sharing all the information on here for all. No, you have not read through every page, or, you did not comprehend what you were trying to read. The answers are all there...... Fix it yourself. Seems third grade did not do you much good ...... "Nuff said " ........... Now then, I have some cheese to go along with your whine ..........

Like he said. I'm not trying to be smart either, but go back one page. The document number and PIT number is what you need. That is all the service department needs to be able to bring it up on their computer and print out the complete document .......

Yep, like he said ......

My 2015 GMC Sierra came from factory with the features ....... Mine is a factory order, didn't buy off lot .....

Well, I'll definitely be able to tell if it make a positive difference out here in this country I live in. If they are not what I would want , I'll put the OEM PSX24W (I think that's it) back in .......

Take a PHILLIPS screwdriver with you and turn the up / down headlight adjustment 1/4 turn at a time in the counterclockwise direction to adjust the beam UP ..... A 1/4 turn makes a big adjustment down road. Make sure you keep the exact turn on each beam so as to keep the lights synchronized ..... See my post on adjusting the aim on my headlights ...... I left mine about a 1/4 turn on the high side and I see pretty darn good, but doesn't blind oncoming .........

I ordered a pair of these this morning...... Gonna try 'em out here in the rural ranch country where I live. Maybe get some more additional peripherial lighting in addition to my PIT5374 headlight upgrade ...... And I also finally found the GM Part #23342527 on line at a GM dealer here in Texas and so, I ordered two more of the Vosla bulbs to have on hand for spares ....... I learned a long time ago out here in the "real" boonies, to have spare headlight bulbs on hand. I recently had two low beam bulbs go out on my 2005 GMC Sierra within 30 minutes of each other and I was 17 miles from the ranch. Made it home on the fogs and highbeams. Replace both bulbs next morning and immediately ordered new Silverstar Ultras for spares.....

And last, again ....... although updated to PIT5374A ...... reads the same except for dealer labor hours .... Read the first paragraph carefully .........

No way to adjust from side to side, except to loosen the top fasteners and try to turn the headlights inward with the "slack" n the mounting holes. I do not seem to have that issue with my headlights. If, in fact, you think that is a problem, it would show up very noticeable on an alignment screen. See my procedure below that I did on my truck. Make sure the bulbs are "seated " fully, twisted all the way clockwise. This will effect headlight aiming if not seated fully and appear to have a "dead spot" in the lighting pattern. My mechanic told me he did not have any way to do the alignment procedure. My dealer is a small town, west Texas dealer. They have very good GM mechanics and are very good and knowledgable, but their on site size is limited. My service manager gladly printed the PIT5374 bulletin and gave it to me. I have a fairly big metal shop building here at the ranch, so I pulled my truck in and closed the doors. I set up a "screen" on the inside of the roll up door as per the instructions in the TSB. When I turned out the shop lights, I could see the cutoff line very well. As it turned out, my headlights were within 1/2 turn of each other vertically. I syncronized (spelling ?) with each other and then proceded to perform the alignment procedure. I ended up raising each headlight exactly 1 1/2 turns on the adjustment screws to bring them to the cutoff lines on the door screen. I think I left mine very slightly (1/4 turn) on the high side of the final alignment, but not too high for oncoming traffic. It did make a big difference with the down road visibility. A quarter to half turn on the adjustment screws is very noticeable on the alignment screen......... And while I was set up, I also did the procedure on my fog lamps. It helped them also. Same procedure, just different vertical height measurements on my door screen.....

These are my before and after photos ...... I do not believe the upgrade is as bright as my 2005 GMC, BUT it is much, much better. I can now see the shoulders of the highway and I can see much farther down the highway. I do believe the lighting is AT LEAST 30% better, but probably much more. I think I am willing to drive my new truck in the dark now. I can even see the dark ranch road to turn into the ranch now, whereas before I could not. The first two photos are the before photos. The next two are the after TSB photos. And the last one photo is the OEM headlights with Sylvannia Silverstar Ultra bulbs on my 2005 GMC 2500 HD.

These are the actual Vosla bulbs and AC Delco / GM Part numbers installed in my truck on March 5th at my service department.

No, these bulbs will not fit the headlights. This is not the same bulb fitment. These bulbs you are listing are the fog light bulbs .......

No, don't pull up on the air box to pop it out. The nub that you are wanting to dislodge, is in an open, slide in slot. You can move the air box slightly inward toward the engine compartment and it will disengage from the slot and not damage the mounting nub.

According to your documentation, you did not get the updated headlight bulbs installed in your truck. The documentation indicates that the bulbs ordered and installed are the initial OEM Philips bulbs which ARE NOT the update as per PIT5374 ~ PIT5374A ....... You definitely need to make another trip back to your service department .......

Read the document. PIT5374 posted earlier in this thread .......................