GMC headlights - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Vintage Windmills · 02-12-2011, 06:33 PM

Ok, dumb question but how are the headlights configured on a GMC? Are all the bulbs the same and the inner pair just aimed higher for the high beams? I thought there was only one style of T3? Are only 2 on at a time when on high or low?

Longhorn Man · 02-12-2011, 06:40 PM

outers are low/high inners are high only.
when on in low beam, only the outers are on
when on in hight beam, all 4 are on.
T3 made both the inner and outer, plus the larger 7 inch bulbs too

Vintage Windmills · 02-12-2011, 06:46 PM

Thanks Andy, so all four bulbs are the same?

**special-K** · 02-12-2011, 06:59 PM

No. He said the outers are hi/lo beam and the inners are hi-only...inner= single element and outer = double element. T-3 was a series of bulb made by Wagner,I believe. I'd have to check. Haven't thought about it for a while. T-3s are like Super Blues or other series made by the same company.

Vintage Windmills · 02-12-2011, 07:07 PM

Just looked at my 2 GMC's and it looks like the inners are marked with a "1" and the outers are marked with a "2". I also just learned the headlight bezel is a little different between a 69 and a 67 in that the 69 has reliefs for the screwdriver so the bezel can stay while the headlights are worked on

**too much stuff** · 02-12-2011, 07:25 PM

I think you will find a double plug on one headlight, and a triple on the other. And you are correct, 67 didn't have any notches to aim the headlights in the bezel. Most 68s did, but not all.

sjarrett71 · 02-12-2011, 09:00 PM

The headlights are 2 different part numbers at the parts store too.

Vintage Windmills · 02-12-2011, 09:52 PM

Quote:

Originally Posted by too much stuff

I think you will find a double plug on one headlight, and a triple on the other.

Yep, I noticed that after I got them out. Good news, I've got 3 T3's for the 67.

463 · 02-12-2011, 10:08 PM

http://www.sylvania.com/ConsumerProd...RG-Results.htm here is part #s that are the new replacement #

High beam headlamp
H5001

Low beam headlamp
H5006

Longhorn Man · 02-13-2011, 01:46 AM

they make repro T3 lamps now... so don't spend too much time looking for 40 year old lamps.

02-12-2011, 06:33 PM	#1
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	GMC headlights Ok, dumb question but how are the headlights configured on a GMC? Are all the bulbs the same and the inner pair just aimed higher for the high beams? I thought there was only one style of T3? Are only 2 on at a time when on high or low? __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

02-12-2011, 06:40 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: GMC headlights outers are low/high inners are high only. when on in low beam, only the outers are on when on in hight beam, all 4 are on. T3 made both the inner and outer, plus the larger 7 inch bulbs too

02-12-2011, 06:46 PM	#3
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: GMC headlights Thanks Andy, so all four bulbs are the same? __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

02-12-2011, 06:59 PM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: GMC headlights No. He said the outers are hi/lo beam and the inners are hi-only...inner= single element and outer = double element. T-3 was a series of bulb made by Wagner,I believe. I'd have to check. Haven't thought about it for a while. T-3s are like Super Blues or other series made by the same company. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 02-12-2011 at 06:59 PM.

02-12-2011, 07:07 PM	#5
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: GMC headlights Just looked at my 2 GMC's and it looks like the inners are marked with a "1" and the outers are marked with a "2". I also just learned the headlight bezel is a little different between a 69 and a 67 in that the 69 has reliefs for the screwdriver so the bezel can stay while the headlights are worked on __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

02-12-2011, 07:25 PM	#6
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,769	Re: GMC headlights I think you will find a double plug on one headlight, and a triple on the other. And you are correct, 67 didn't have any notches to aim the headlights in the bezel. Most 68s did, but not all. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

02-12-2011, 09:00 PM	#7
sjarrett71 Registered User Join Date: Dec 2006 Location: Rolla, MO Posts: 2,463	Re: GMC headlights The headlights are 2 different part numbers at the parts store too. __________________ -Scott-

02-12-2011, 10:08 PM	#9
463 Registered User Join Date: Nov 2007 Location: Sask Canada Posts: 1,666	Re: GMC headlights http://www.sylvania.com/ConsumerProd...RG-Results.htm here is part #s that are the new replacement # High beam headlamp H5001 Low beam headlamp H5006 __________________ Trueman

02-13-2011, 01:46 AM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: GMC headlights they make repro T3 lamps now... so don't spend too much time looking for 40 year old lamps.

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