1987 single headlight to 1991 suburban 4 headlight wiring - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cst70rocket · 11-03-2012, 12:42 AM

Ok guys, I searched and searched and found no good answer. I put the '91 sub core support in my '87 1 ton today, and need to know exactly how to wire it up. My truck was a custom deluxe, so it only had 2 headlights. If anyone can point me in the right direction I'd appreciate it. I can chase down wiring if I have to, but I'm in a hurry on this deal and can really use help.
Thanks,
Kirk

frog210 · 11-03-2012, 01:13 AM

Dont quote me on this but i think you can get the light harness of that 91 burb and put it on your 87
or you can just wire it up from scratch find your high beem, make it your top or bottom and low beam,
just get a test light then splice in to wire that is hot when you switch from high/low

Mr. 250r · 11-03-2012, 02:39 AM

Did you not get the 4 head light wiring harness? Because if you did it should just plug in where the old one did

*bk2life* · 11-03-2012, 03:57 AM

yep. get the harness, it's plug and play.

if no harness, get a test light, turn lights on find the high and low and splice them.

its only lights, one ground, one power for low, one for high.

Edahall · 11-03-2012, 05:01 AM

If you don't have the harness, this would be a good time to relay the headlights. The stock wiring was mediocre at best.

cst70rocket · 11-03-2012, 01:04 PM

I've got the entire harness, but the '87 is totally different from the '91. The blades are bigger, and it's configured differently. The '87 has 10 wires total, and the '91 has 12 I believe. If it was plug and play I would've done that already. The only way this is a plug and play is if you change the fuse box out. But thanks for the info lol.

1987ls1truck · 11-03-2012, 01:10 PM

im doing this swap on my 87 and i bought one off a guy who converted his !! he made the 4 headlight harness to the 87 bulkhead i can take a pictures of it if youd like lemme know

Edahall · 11-03-2012, 01:18 PM

Besides not having to buy another harness, another benefit of relaying the whole deal is you'll be able to run all 4 lights at once when switched to high beam.

cst70rocket · 11-03-2012, 01:34 PM

Quote:

Originally Posted by 1987ls1truck

im doing this swap on my 87 and i bought one off a guy who converted his !! he made the 4 headlight harness to the 87 bulkhead i can take a pictures of it if youd like lemme know

If you don't mind, snap a pic. Thanks.

1987ls1truck · 11-03-2012, 01:45 PM

here are three pics hope they help one is of the factory bulkhead in my rats nest of wires waiting to be installed LOL

11-03-2012, 12:42 AM	#1
cst70rocket Registered User Join Date: Sep 2005 Location: San Angelo or Eufaula Posts: 301	1987 single headlight to 1991 suburban 4 headlight wiring Ok guys, I searched and searched and found no good answer. I put the '91 sub core support in my '87 1 ton today, and need to know exactly how to wire it up. My truck was a custom deluxe, so it only had 2 headlights. If anyone can point me in the right direction I'd appreciate it. I can chase down wiring if I have to, but I'm in a hurry on this deal and can really use help. Thanks, Kirk

11-03-2012, 01:13 AM	#2
frog210 Registered User Join Date: Mar 2012 Location: San Antonio, Tx Posts: 784	Re: 1987 single headlight to 1991 suburban 4 headlight wiring Dont quote me on this but i think you can get the light harness of that 91 burb and put it on your 87 or you can just wire it up from scratch find your high beem, make it your top or bottom and low beam, just get a test light then splice in to wire that is hot when you switch from high/low __________________ San Antonio, TEXAS -Frog -I'm a valet and well I've driven BMWs, Mercedes, Porsche,Bentlys, fiats, Hondas, etc and well even do I like a few features, I love my shortbed, it dosent bore me out, just press on the gas and you'll remember why you love it.

11-03-2012, 02:39 AM	#3
Mr. 250r Registered User Join Date: Dec 2010 Location: freeburg, illinois Posts: 885	Re: 1987 single headlight to 1991 suburban 4 headlight wiring Did you not get the 4 head light wiring harness? Because if you did it should just plug in where the old one did __________________ 1987 Chevy V30 - http://67-72chevytrucks.com/vboard/s...d.php?t=573854 1988 IROC-Z Camaro - 305/T5 T-Top 1989 GMC V35 - Marbolo Express http://67-72chevytrucks.com/vboard/s...d.php?t=596850 1991 V2500 Suburban Silverado - Sold 1991 V2500 Suburban Scottsdale - Big Nasty http://67-72chevytrucks.com/vboard/s...d.php?t=497423 2001 Ram 3500 5.9 H.O NV56 EC DRW - Sold 2003 1500 Silverado 2004 Ram 3500 5.9 H.O NV56 CC DRW - Sold 2005 Silverado 2500HD 6.6/ZF6 CC LWB

11-03-2012, 03:57 AM	#4
bk2life Account Suspended Join Date: Oct 2012 Location: phx, az Posts: 868	Re: 1987 single headlight to 1991 suburban 4 headlight wiring yep. get the harness, it's plug and play. if no harness, get a test light, turn lights on find the high and low and splice them. its only lights, one ground, one power for low, one for high.

11-03-2012, 05:01 AM	#5
Edahall Registered User Join Date: May 2011 Location: Goliad, TX Posts: 672	Re: 1987 single headlight to 1991 suburban 4 headlight wiring If you don't have the harness, this would be a good time to relay the headlights. The stock wiring was mediocre at best. __________________ 1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift

11-03-2012, 01:04 PM	#6
cst70rocket Registered User Join Date: Sep 2005 Location: San Angelo or Eufaula Posts: 301	Re: 1987 single headlight to 1991 suburban 4 headlight wiring I've got the entire harness, but the '87 is totally different from the '91. The blades are bigger, and it's configured differently. The '87 has 10 wires total, and the '91 has 12 I believe. If it was plug and play I would've done that already. The only way this is a plug and play is if you change the fuse box out. But thanks for the info lol.

11-03-2012, 01:10 PM	#7
1987ls1truck Registered User Join Date: Jul 2012 Location: pittsburgh PA Posts: 39	Re: 1987 single headlight to 1991 suburban 4 headlight wiring im doing this swap on my 87 and i bought one off a guy who converted his !! he made the 4 headlight harness to the 87 bulkhead i can take a pictures of it if youd like lemme know

11-03-2012, 01:18 PM	#8
Edahall Registered User Join Date: May 2011 Location: Goliad, TX Posts: 672	Re: 1987 single headlight to 1991 suburban 4 headlight wiring Besides not having to buy another harness, another benefit of relaying the whole deal is you'll be able to run all 4 lights at once when switched to high beam. __________________ 1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift

11-03-2012, 01:45 PM	#10
1987ls1truck Registered User Join Date: Jul 2012 Location: pittsburgh PA Posts: 39	Re: 1987 single headlight to 1991 suburban 4 headlight wiring here are three pics hope they help one is of the factory bulkhead in my rats nest of wires waiting to be installed LOL Attached Images



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