trailer wiring help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cochino12 · 03-02-2005, 12:41 PM

Can anyone tell me how to wire this dang trailer harness? I have a flat 4 pin harness and dont know what goes where, all I know is that white is ground. There is also a green yellow and a brown wire. I dont have anyone to hit the brake here and test the brake wire so I was hoping someone here might know what colors go where. thanks for any help

Chevy67Tk · 03-02-2005, 12:51 PM

i got you one more figured out

The white is ground
The Brown is marker / clearance lights

The yellow and the green are for your turn signal and stop lights I just cant remember witch is right and witch is left.

plumbcut · 03-02-2005, 12:53 PM

http://www.accessconnect.com/trailer_wiring_diagram.htm

EricS76 · 03-02-2005, 03:11 PM

green=right
yellow=left

Mike76251 · 03-03-2005, 07:28 AM

You can get a board or stick or something like that and hit the brake switch.......just wedge it with a brick.

alf4444 · 03-03-2005, 04:04 PM

getting ready for EJS?

Russell · 03-03-2005, 07:02 PM

Easiest way to test the brake lights -- Pull the brake switch out a little bit, the lights will then remain in the on position as in it's natural state, the switch is normally closed (aka, no pressure on switch with pedal up = lights on)

For testing signal lights, just turn it on and check it with a test light

PS -- I would very highly reccomend installing a 7 pin connector right away. You can easily buy / build the adapter you need for a 4 pin, or 5 pin connector, but the bulk of larger trailers these days come with a 7 pin connection on it

cochino12 · 03-03-2005, 08:27 PM

Quote:

Originally Posted by alf4444

getting ready for EJS?

No, I just need another truck to pull my landscape trailer this summer

Russell: Thanks for the tip, I actually will have some people at the house tomorrow so I will just MAKE them help me ha ha. I dont think this blazer will pull anything too heavy so I will just stick with the 5 pin harness. Now the '73 I will probably wire the way you suggested

tommyd34 · 03-03-2005, 09:10 PM

put your 4way flashers on the wire that is blinking when you check with a tester is your brake and signal that is the ones you hook the green and yellow up to then turn your harazzards of and turn on your tail lights then check the wire harness again this is the one you hook your brown to

kblazer87 · 03-03-2005, 10:23 PM

WalMart, Kmart and most of the autoparts stores sell a prewired trailer harness that will plug into your harness at the rear of the truck. No searching or poking or anything else needed. You unplug the harness under the rear of the truck and plug the trailer harness in place. Then you use an existing screw point for the ground wire and you are done and ready to tow. It costs around 13.00 or so if I remember correctly. I put one on my 87' Blazer when I first got my trailers 4 years ago. They are more expensive than the regular 4 flats, but that is more than made up for in the ease of installation. It took me less than 15 minutes including reading the directions. The hard part is finding a ground screw to use. Hoppy makes them.

cochino12 · 03-03-2005, 10:28 PM

I didnt think the plug in harness was available for a vehicle as old as mine, thats the last time I listen to those idiots at checker auto parts (I am an idiot for believing him too).

I went to napa found a plug in harness and they still dont work right though, I have no brake lights, left turn signal activates left turn signal on trailer but the park lights work ha ha. Looks like I am going to have to hardwire it anyway

Of course the PO hacked into these wires too, WTF do are people thinking when they half A$$ things. Dont they realize it makes things more of a pain in the butt?

magnethead · 03-04-2005, 12:04 AM

we have a HD 7 pin since we had the race trailer..we wired it ourselves with a trailer brake and something like 10 amp connectors....got it's share of abuse...go 7 pin. You'll enjoy the accessory connection.

alpha_male0203 · 03-04-2005, 12:55 AM

I was wondering. What it take to make the bed to a trailer. i was thinking of doing this if i dont sell my 81 truck bed. is it hard just cut the frame then weld one of those goose neck things to it them the wires. right?

03-02-2005, 12:41 PM	#1
cochino12 It followed me home? Join Date: Mar 2003 Location: Yup Posts: 5,751	trailer wiring help Can anyone tell me how to wire this dang trailer harness? I have a flat 4 pin harness and dont know what goes where, all I know is that white is ground. There is also a green yellow and a brown wire. I dont have anyone to hit the brake here and test the brake wire so I was hoping someone here might know what colors go where. thanks for any help __________________ Adam That's why they call it a shortcut Kyle, if it was easy it would just be the way. 86 c-10 SWB 85 CCSB 90 GMC K30 Crew SRW 1985 C30 Dually

03-02-2005, 12:51 PM	#2
Chevy67Tk Registered User Join Date: Mar 2003 Location: PA Posts: 349	i got you one more figured out The white is ground The Brown is marker / clearance lights The yellow and the green are for your turn signal and stop lights I just cant remember witch is right and witch is left. __________________

03-02-2005, 03:11 PM	#4
EricS76 Registered User Join Date: May 2004 Location: Llano,TX Posts: 113	green=right yellow=left __________________ ‘66 Chevy C-10, long bed fleetside, 350, 3 on the tree, 4-7 drop. '77 chevy C-10 Custom Deluxe, 350, SM465 4 speed, flatbed. '80 jeep CJ-5. ‘14 Chevy 1500 Z71…

03-03-2005, 04:04 PM	#6
alf4444 Registered User Join Date: Dec 2002 Location: taylorsville, UT Posts: 778	getting ready for EJS? __________________ 2011 CCSB GMC 2500HD DMAX 73 GMC 3/4 ton 4x4 96 Chevy 1500 STD Cab Shortbed Z71 Owner of WickedWolfRC.com

03-03-2005, 07:02 PM	#7
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Easiest way to test the brake lights -- Pull the brake switch out a little bit, the lights will then remain in the on position as in it's natural state, the switch is normally closed (aka, no pressure on switch with pedal up = lights on) For testing signal lights, just turn it on and check it with a test light PS -- I would very highly reccomend installing a 7 pin connector right away. You can easily buy / build the adapter you need for a 4 pin, or 5 pin connector, but the bulk of larger trailers these days come with a 7 pin connection on it __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

03-02-2005, 12:53 PM	#3
plumbcut california fill Join Date: Apr 2004 Location: Sunny So-Cal Posts: 694	http://www.accessconnect.com/trailer_wiring_diagram.htm

03-03-2005, 07:28 AM	#5
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,499	You can get a board or stick or something like that and hit the brake switch.......just wedge it with a brick.

03-03-2005, 09:10 PM	#9
tommyd34 Registered User Join Date: Feb 2004 Location: belleville ont canada Posts: 29	put your 4way flashers on the wire that is blinking when you check with a tester is your brake and signal that is the ones you hook the green and yellow up to then turn your harazzards of and turn on your tail lights then check the wire harness again this is the one you hook your brown to

03-03-2005, 10:23 PM	#10
kblazer87 Registered User Join Date: Nov 2004 Location: Lawrenceburg, In Posts: 78	WalMart, Kmart and most of the autoparts stores sell a prewired trailer harness that will plug into your harness at the rear of the truck. No searching or poking or anything else needed. You unplug the harness under the rear of the truck and plug the trailer harness in place. Then you use an existing screw point for the ground wire and you are done and ready to tow. It costs around 13.00 or so if I remember correctly. I put one on my 87' Blazer when I first got my trailers 4 years ago. They are more expensive than the regular 4 flats, but that is more than made up for in the ease of installation. It took me less than 15 minutes including reading the directions. The hard part is finding a ground screw to use. Hoppy makes them.

03-03-2005, 10:28 PM	#11
cochino12 It followed me home? Join Date: Mar 2003 Location: Yup Posts: 5,751	I didnt think the plug in harness was available for a vehicle as old as mine, thats the last time I listen to those idiots at checker auto parts (I am an idiot for believing him too). I went to napa found a plug in harness and they still dont work right though, I have no brake lights, left turn signal activates left turn signal on trailer but the park lights work ha ha. Looks like I am going to have to hardwire it anyway Of course the PO hacked into these wires too, WTF do are people thinking when they half A$$ things. Dont they realize it makes things more of a pain in the butt? __________________ Adam That's why they call it a shortcut Kyle, if it was easy it would just be the way. 86 c-10 SWB 85 CCSB 90 GMC K30 Crew SRW 1985 C30 Dually

03-04-2005, 12:04 AM	#12
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	we have a HD 7 pin since we had the race trailer..we wired it ourselves with a trailer brake and something like 10 amp connectors....got it's share of abuse...go 7 pin. You'll enjoy the accessory connection.

03-04-2005, 12:55 AM	#13
alpha_male0203 95 extended cab sportside Join Date: Jul 2004 Location: Clinton, Iowa western. Posts: 895	I was wondering. What it take to make the bed to a trailer. i was thinking of doing this if i dont sell my 81 truck bed. is it hard just cut the frame then weld one of those goose neck things to it them the wires. right? __________________ 95 Chevy k 1500 00 Chevy Silverado 1500 07 cobalt Old ladies car]



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