1966 GMC Suburban Wiring Diagram - The 1947 - Present Chevrolet & GMC Truck Message Board Network

YoungMechanic · 09-05-2011, 11:23 AM

I don't know why I didn't ask this questions about a week ago but I have been searching everywhere for a wiring diagram of my 1966 GMC suburban. The only diagrams I can find have to be purchase and hope someone has one I could use. My suburban has two headlights and a parking light in the front if that helps. I know this is a long shot but I will keep my fingers crossed.

dthela · 09-05-2011, 03:56 PM

do google search for pictures, i found a nice color one on there

dthela · 09-05-2011, 03:57 PM

whats wrong with it?

YoungMechanic · 09-07-2011, 11:45 AM

I have done google searches and can only find the pay ones. I purchased a new wiring harness and have been trying to rewire the headlights. The only diagrams I can find are for two headlights and I am looking for 4 headlights diagram. If you could post the link to the diagram you mention that would be great.

kieth · 09-07-2011, 02:07 PM

dual headlight systems work like this:

Low beams have 3 pole sockets

hi beam bulbs have 2 pole sockets:

when the low beams are on the low beam lights come on, when you turn on the hi beams the power goes to the hi beam bulb as well as the hi beam bulb in the low beam bulb.

Do it with relays, it will make the light a lot brighter since the bulbs will be drawing power directly from the battery instead of through the headlight switch. Kieth

I just rewired my 66 gmc and it has 4 bulbs went to halogen bulbs (only $7.00 each) sure puts out a lot more light.

rustyrodknocker · 10-15-2011, 12:24 PM

is there a diagram for this mod on here? or part#'s for the relays and bulbs? I have some random relays. old harley stuff. I have a ford type solenoid on the fenderwell so battery power to the relays would be easy. I even have a multiple relay mount that could be put next to the solenoid. then one for high beam and one for low? two wires to the dimmer switch? some night photos of the difference would be good. or some feedback on any relay failures.

Rich 5150 69 · 10-15-2011, 12:35 PM

http://67-72chevytrucks.com/vboard/s...d.php?t=397695
This one is in the FAQ section, there might be another one.

padresag · 10-15-2011, 12:42 PM

everything that you need is on this page
http://www.6066gmcguy.org/wire-tips.htm
ron

dthela · 10-15-2011, 06:33 PM

search google pictures for the diagrams, i found the color ones on there

09-05-2011, 11:23 AM	#1
YoungMechanic Registered User Join Date: May 2009 Location: Orem, Utah Posts: 7	1966 GMC Suburban Wiring Diagram I don't know why I didn't ask this questions about a week ago but I have been searching everywhere for a wiring diagram of my 1966 GMC suburban. The only diagrams I can find have to be purchase and hope someone has one I could use. My suburban has two headlights and a parking light in the front if that helps. I know this is a long shot but I will keep my fingers crossed.

09-05-2011, 03:56 PM	#2
dthela Registered User Join Date: Jul 2011 Location: N Kingstown, R.I. Posts: 305	Re: 1966 GMC Suburban Wiring Diagram do google search for pictures, i found a nice color one on there

09-05-2011, 03:57 PM	#3
dthela Registered User Join Date: Jul 2011 Location: N Kingstown, R.I. Posts: 305	Re: 1966 GMC Suburban Wiring Diagram whats wrong with it?

09-07-2011, 11:45 AM	#4
YoungMechanic Registered User Join Date: May 2009 Location: Orem, Utah Posts: 7	Re: 1966 GMC Suburban Wiring Diagram I have done google searches and can only find the pay ones. I purchased a new wiring harness and have been trying to rewire the headlights. The only diagrams I can find are for two headlights and I am looking for 4 headlights diagram. If you could post the link to the diagram you mention that would be great.

09-07-2011, 02:07 PM	#5
kieth Registered User Join Date: Sep 2010 Location: Tulsa, Oklahoma Posts: 1,925	Re: 1966 GMC Suburban Wiring Diagram dual headlight systems work like this: Low beams have 3 pole sockets hi beam bulbs have 2 pole sockets: when the low beams are on the low beam lights come on, when you turn on the hi beams the power goes to the hi beam bulb as well as the hi beam bulb in the low beam bulb. Do it with relays, it will make the light a lot brighter since the bulbs will be drawing power directly from the battery instead of through the headlight switch. Kieth I just rewired my 66 gmc and it has 4 bulbs went to halogen bulbs (only $7.00 each) sure puts out a lot more light.

10-15-2011, 12:24 PM	#6
rustyrodknocker Registered User Join Date: Dec 2010 Location: salem oregon Posts: 414	Re: 1966 GMC Suburban Wiring Diagram is there a diagram for this mod on here? or part#'s for the relays and bulbs? I have some random relays. old harley stuff. I have a ford type solenoid on the fenderwell so battery power to the relays would be easy. I even have a multiple relay mount that could be put next to the solenoid. then one for high beam and one for low? two wires to the dimmer switch? some night photos of the difference would be good. or some feedback on any relay failures.

10-15-2011, 12:35 PM	#7
Rich 5150 69 Registered User Join Date: Nov 2009 Location: Galt, Calif Posts: 2,437	Re: 1966 GMC Suburban Wiring Diagram http://67-72chevytrucks.com/vboard/s...d.php?t=397695 This one is in the FAQ section, there might be another one. __________________ `64 C10 vortec 350/350/373 posi `69 RS/SS 350/350/308 `37 Ford 406/350/324 traclock `68 Dart 370/904/323 suregrip

10-15-2011, 12:42 PM	#8
padresag Registered User Join Date: Feb 2008 Location: Sidney,b.c. Posts: 4,425	Re: 1966 GMC Suburban Wiring Diagram everything that you need is on this page http://www.6066gmcguy.org/wire-tips.htm ron

10-15-2011, 06:33 PM	#9
dthela Registered User Join Date: Jul 2011 Location: N Kingstown, R.I. Posts: 305	Re: 1966 GMC Suburban Wiring Diagram search google pictures for the diagrams, i found the color ones on there



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