Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Chevy Silverado and GMC Sierra Trailer and Towing Questions



  • jgc61jgc61 Posts: 1
    I have a 2003 Silverado 1500 4X4.

    6 of the pins work as required.
    Running Lamps
    Left Stop/Tail
    Electric Brakes
    Right Stop/Tail
    Back Up Lights

    The pin marked + has no power.
    I believe this should have power at all times
    I need power at this pin to activate the deck lights on my Imperial car trailer
    Thanks for your help
  • gewccwgewccw Posts: 1
    I have a 1999 Sierra and just installed a 7 pin trailer plug, replacing the 4 wire plug that was there. All the pins are working except the Aux power one because I could not figure out which wire to hook it to. I installed a 40amp fuse in Stud 1 and I have 2 batteries, but the connection point does not have power going to it when the car is on or off. I also looked under the master cylinder and there are no wires taped there.
    SO, can you tell me which wire is the aux power (switched 12v) wire so that I can hook it to the 7 pin receptacle?
  • ajhamelajhamel Posts: 1
    I have a seven pin connector on the truck but the brake light wire is not hooked to it, thus I have no break light on my trailer. Will a tail light converter fix this problem? I tried to splice the brake light wire to the left/right turn signal, but when I have the break pressed in the blinkers will not work.
  • saintsxlivsaintsxliv Posts: 1
    I have a problem with the harness on my Chevy. The only power I have at the harness is the park lights ( no turn or brake lights) all fuses check good.
    Any help is appreciated!!
  • middy1middy1 Posts: 1
    I have a 2002 Silverado. Factory wiring without a brake controller inline. For some reason I have power out of the + trailer brake position on the 7 pin on the truck. Can't figure it out. Only about 2.5 V. Seems to be enought to supply the magnet on the trailer brakes. Seems like the magnet engages enough to drag and push the front brake shoe causing it to drag. I have installed a Brake controller. Also have safety brakeaway switch. With that said, the problem exists with or without the controller. I sure hope there's someone with experience in this department. Any help or suggestions would be awesome at this point......

  • jsealyjsealy Posts: 1
    Have a new Silverado 1500, 4,8L V8, 4sp auto, trailering package (trans cooler, limited slip diff, transmission trailering switch for trans, hitch and wiring) and brake controller. Chevy rates this truck with its 3.23 rear for 4700 lbs towing. I purchased the truck to trailer a 3000 lb piece of equipment, but the trailer I want to purchase weighs 2100 lbs. So I will be 400 lbs over.

    I plan to add a transmission temp guage. I would appreciate any comments.

  • covemancoveman Posts: 5
    Just purchased a 2010 Sierra 1500 Z71 and was advised that it could tow up to 9700 pounds. First trip out, I discovered the truck is unable to handle my trailer that has a dry weight of 7500 pounds and do not exceed 8500 pounds gross. Unable to exceed 50 miles an hour due to excessive swaying and has been advised by the RV dealer to park the trailer due to a safety hazzard. The RV dealer has checked out the trailer, hitch and all attachments with no issues. The GMC dealer checked out the suspension and found no problems either and then suggested a tire upgrade, done that with 10 plys but did not help. Now they are suggesting air bags??? To be installed tomorrow. They also advised me that I was the first case reported but now learning it may be a common problem with the new models. Older models with the same specs as mine, tow the trailer fine. Wondering how common is this problem and looking for suggestions on how to rectify my problem.
  • grizzly4grizzly4 Posts: 12
    Do you have an equalizer hitch? What's the tongue weight on the trailer and max allowable tongue weight for the truck?
  • covemancoveman Posts: 5
    The hitch is a Reese with 1200 pound bars and I'm using the dual cam sway control. The tongue weight of the trailer (Jasper Trail 29RKS) is 748 pounds empty. The tongue weight for the truck with weight distribution is 1100.
  • gmcustsvcgmcustsvc Posts: 4,055
    Hello Coveman,
    I apologize that you are experiencing a problem with your vehicle. Can you please keep me informed on the fixes go. Can you please email me your VIN so I can look to see exactly what your vehicle should tow for you? You can get my email by clicking on my name. Thank you,
    Mariah GM Customer Service
  • grizzly4grizzly4 Posts: 12
    Are the truck and trailer level when the equalizer hitch is connected? Can't thank of any other reason for it to have such a large sway problem. 750 pounds is a lot of tongue weight. Good luck
  • covemancoveman Posts: 5
    Even though the trailer is within GM's posted weights of 9600 pounds for trailer capacity (7538), and 1100 tongue weight ( 748) it has been concluded by some GM staff, the RV dealership and other professionals the truck is unable to safely tow my trailer. At this point, my only option now is to downsize the trailer...has not been a great week. Vehicle was purchased based on online searches, GM specifications, discussions with persons who own vehicles 2007 and older and four different GM salesmen at different dealerships. All advised the truck could tow the trailer. Great truck for a car, but I wanted a truck...strange two older models with lower posted towing capacities than mine could tow the trailer without a problem, the 2009's and 10's not a chance. I have exhauted all avenues with the GM dealership and I am stuck with a truck that I wish otherwise. Fortunately for me, the RV dealer came through and gave me a full refund and offered a new downsized trailer whick I have accepted. I am hearing horror stories oll over the province similiar to mine. From suggestions from various GM staff I ungraded tires, installed air bags, and done everthig possible with leveling and several other changes for the past three weeks...all at my expense with one execption, the dealer installed the air bags I purchased. Anybody out there having the same delemma?
  • grizzly4grizzly4 Posts: 12
    Sorry to hear that Coveman. I upgraded my trailer and truck last year. I used to have a 2003 Chevy 1/2 ton ext cab. Now we have a 2009 Ford F150. It pulls our NRG Toy Hauler all over and up and down the biggest mountains with ease. I live in Montana and we have big hills. I installed air bags. Sure wish GM would get with the program. I loved my Chevy truck. BTW, I wanted to buy a new Chevy but couldn't get a 1/2 ton that would pull the trailer.
  • covemancoveman Posts: 5
    edited June 2010
    I hear you, if I did not need the truck for heavy duty towing, I would love my Sierra too. I sure wish GM produced a 1500 model that retained the older models towing capabilities. Ironically, one of the older trucks I used to sucessfully tow the trailer was a 2003 chevy, great truck. As soon as I can, I plan to unload the GM and possibly get a Ford as well. Hear they are getting great mileage and have great towing abilities, they appear to have come a long way over the past couple years.
  • covemancoveman Posts: 5
    Today my dealer installed new rear leaf springs (under warranty) which made a remarkable positive change to the overall performance to the truck. Apparently the truck was rust proofed and the dealer is suspecting this to be the cause of rubber/bushing failure in the springs.....similiar local experiences are being acknowledged with other GM' trucks as well as trucks from other dealers. Interesting. Not sure if this will address my towing issues until I give it a go in a few weeks but right now it sure is looking good. Will advise.
  • big_al2big_al2 Posts: 1
    hello folks, i have a 2004 silverado LS no towing package, no transmission cooler. What can i do to pull a 5000 lbs. trailer? :surprise:
  • obyoneobyone Posts: 8,065
    airbags and an aftermarket trans cooler
  • Hey obyone -
    my gmc sierra doesn't have a towing package either. I've installed a hitch but haven't been able to find the factory plug for the wiring harness. Where have I missed it?


    :( :confuse:
  • Hey, I have a 2007 Silverado 1500 with tow package. I am getting no power to the center pin (reverse) on my 7 pin plug. I am getting power to every other pin and have checked and replaced all fuses. Any one else have this issue?
  • Hi, I am trying to buy a travel trailer, but don't know what weight I can tow... my husband (out to sea) said don't get anything over 21'... but I can't figure out the whole weight thing; ie tongue, dry, wet, etc!!!
    I have a 2003 Silverado 1500 extended cab with a 6 cyl 4300 and has towing gears on the transmission ???
    The book says it has" tow-haul mode on automatic transmission
    max trailer weight "4700 or 5200lbs"
    I'm looking at a terry resort trailer 24'.
    does anyone know where i can find the info on how much the trailer weighs or would it be printed somewhere on the chassis or interior?
    Thanks for the help!
Sign In or Register to comment.