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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > The 02-09 "How-To" and DIY Section

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  #1  
Old 09-13-2011, 12:20 PM
OldMike OldMike is offline
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How to hook up trailer lights to Envoy

I have an 05 GMC Envoy SLT with towing package and have never towed with it. I just bought a used 4X8 little trailer to haul riding mower. I need to hook up the flat 4 pin connector on the trailer to the round GMC plug. Any one have a pinout of the truck plug?
Thanks, Mike
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  #2  
Old 09-13-2011, 12:28 PM
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Quote:
Originally Posted by OldMike View Post
I have an 05 GMC Envoy SLT with towing package and have never towed with it. I just bought a used 4X8 little trailer to haul riding mower. I need to hook up the flat 4 pin connector on the trailer to the round GMC plug. Any one have a pinout of the truck plug?
Thanks, Mike
um... You go to WalMart, any auto parts store, most hardware stores, any tractor supply type store, or even some truck stops and gas stations, and buy a 7-pin to 4-pin connector adaptor...



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  #3  
Old 09-13-2011, 01:27 PM
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And the pinout of the receptacle is molded into its plastic flap cover. And available through Googling for "Bargman trailer connector" (Bargman being the nickname of the standard 7-pin RV trailer connector). Been posted and discussed quite a few times on trailvoy as well.
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Old 09-13-2011, 04:53 PM
OldMike OldMike is offline
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Thanks, Guys. Did a search but didn't find the pinout. Also too dumb to see the pinout on flap. Was going to be cheap and wire it myself, but if the adapter isn't too pricey, that's the way to go.
Thanks Again, Mike
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  #5  
Old 09-13-2011, 04:55 PM
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Quote:
Originally Posted by OldMike View Post
Thanks, Guys. Did a search but didn't find the pinout. Also too dumb to see the pinout on flap. Was going to be cheap and wire it myself, but if the adapter isn't too pricey, that's the way to go.
Thanks Again, Mike
The adaptor is like $7.00 and available everywhere...

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  #6  
Old 09-13-2011, 05:14 PM
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I've wired them myself in the past, but generally only if I need an extended pigtail (the TB plug is a bit of a stretch to the side).
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Old 09-13-2011, 05:27 PM
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$13 even at UHaul (not the cheapest) but this one has a light in it.

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  #8  
Old 09-14-2011, 09:50 PM
PAblzr PAblzr is offline
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Quote:
Originally Posted by muddy tires View Post
I've wired them myself in the past, but generally only if I need an extended pigtail (the TB plug is a bit of a stretch to the side).
Quote:
Originally Posted by bore_pig View Post
I .... make an extension cord to go between the truck and trailer in that situation.
The TB does require an extension cord for some of the things it ends up towing. I keep it, the seven pin to 4 pin adapter, a spare 5/8" diameter hitch pin w/ clip, an 18 inch length of chain & some threaded chain links ( to extend too short safety chains), and a pair of older style tail light bulbs that are still common on small trailers in the little compartment in the left rear interior panel at all times.

I have also learned over the years that no matter how positive a friend says he is about the size of the coupler on his trailer it is best to take a 1-7/8 and 2" ball with you when picking up a trailer you have not towed before.
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Old 09-15-2011, 01:01 PM
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Originally Posted by bore_pig View Post
I typically use a proper adapter and make an extension cord to go between the truck and trailer in that situation. Why mess with the factory harness if you don't have to?
No. I didn't change the factory harness. I made an extension with a male 7-pin connecter at one end and a flat 4-pin at the other.
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  #10  
Old 09-15-2011, 04:11 PM
PAblzr PAblzr is offline
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I made an extension with a male 7-pin connecter at one end and a flat 4-pin at the other.
Good DIY solution! Why didn't I think of that? What you did is exactly the kind of thing I come to Trailvoy to learn so 1) I spend less money and 2) I do not have to rely on others to solve all my problems.
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