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Expert Answers about GMC Topkick


  • Hitch for 2005 GMC C5500 Topkick with Tommy Lift
  • The # TLF1003-30 hitch you're asking about is designed for a 1999-2016 Ford F350, F450 or F550 chassis/cab and wouldn't fit your Topkick. For your truck, you'd need a multi fit hitch for heavy duty trucks as none of our vendors offer a custom made fit. In order to choose the correct one, you'll need to know the needed drop, height difference between the rear bumper and the underside of the Tommy Lift. If these heights are even, use the # 3371801050 from Buyer's Products. For a 3 inch...
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  • Dimensions of the SumoSpring Helper Spring for a 2009 GMC Topkick
  • The bump stop is 5" long on the SumoSprings Solo Custom Helper Springs - Front Axle item # SSF-281-47. The bracket is 7/8". This is a confirmed fit for a 2009 GMC Topkick. I have attached a diagram I made below.
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  • How to Connect a Tekonsha Prodigy P3 Brake Controller to a 2005 GMC C4500 Topkick
  • You can install your Tekonsha Prodigy P3 # 90195 in your 2005 GMC C4500 Topkick, but, your vehicle does not have a brake controller port, so there is no adapter. But, never fear, there is a way to use your Prodigy with your truck. The P3 will need to be hardwired into your truck using a 4 & 7-Way Installation Kit, # ETBC7. Normally this would require the installation of a 4-way wiring harness first, which would then be plugged into the # ETBC7. But, since there is not a 4-Way wiring harness...
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  • What Ramps Are Good For Loading A Car Onto A Flat Bed Truck
  • I do not think the Aluminum Car Hauler Ramp Set - 72" x 14-1/2" - 6,000 lbs - Qty 2 # 288-07503 would be the safest set of ramps for this particular job. They can handle the weight of the car no problem but looking at the picture you provided I do no think the angle of the ramps will be low enough to let the car get on the flat bed without bottoming out. I definetly recommend going with a longer set of ramps like the Gen-Y Hitch Aluminum Loading Ramp Set - 96" Long x 15" Wide - 10,000...
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  • Troubleshooting Trailer Brakes Locking Up When Applying Brakes in 1993 GMC Topkick
  • I first recommend making sure that your trailer brake controller is properly adjusted. On most controllers, you are able to adjust the settings to control the amount of power that is initially supplied to the brakes on the trailer. I am not too familiar with the Journey HD unit, but your manual should list the specific steps needed to adjust this setting. If the controller is set up properly, I next recommend checking both the vehicle side connector on your Topkick and the trailer side...
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  • How to Test Trailer Connector Functions on a 1996 GMC Topkick
  • I may have a solution for you but unfortunately we do not have any wiring diagrams for a 1996 GMC Topkick. If you are trying to figure out how the 7-Way at the rear should be wired we do have a picture which shows what the typical layout is (see attached photo on the right side) but it isn't a hard and fast rule that it has to wired that way. The best way to make sure that the 7-Way is wired how you want it is to simply use a circuit tester # PTW2992 and test the functions of the various...
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  • What Brake Controller and Module for 1997 GMC Topkick 6500 Towing 10 Ton Trailer
  • Depending on how your Topkick is equipped, you may need up to 3 items to install a brake controller. If the vehicle does not already have a trailer wiring harness you will first need to install a 4-way wiring harness. Since you seem to have a heavy-duty trailer, we recommend a heavy-duty powered converter, # 119290KIT, rated for 15.9 amps. Next you will need a 4 and 6 Way Installation Kit, # ETBC6. I have included a link to the installation details for this item. This will provide a required...
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  • Buyers Products Fabricators Hitch Plate Kits For a 2006 GMC Topkick 7500
  • I recommend one of the Buyers Products Fabricators Hitch Plate Kits for your 2006 GMC Topkick 7500 as there is not a hitch plate specific to your vehicle. Here are the ones we carry. Buyers Products Fabricators Hitch Plate - 3/4" x 34-1/2" x 22-1/2" # 3371809027A Buyers Products Fabricators Hitch Plate - 5/8" x 34-1/2" x 22-1/2" # 3371809043 Buyers Products Fabricators Hitch Plate - 1/2" x 34-5/8" x 15-5/8" # 3371809040 Buyers Products Fabricators Hitch Plate - 5/8" x 34-1/2" x 15-1/2"...
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  • Adjusting the Settings on a Tekonsha P2 Trailer Brake Controller on a 2005 GMC Topkick 6500
  • The P2, # 90885, is a proportional controller that applies the trailer brakes in proportion to how much the tow vehicle is braking. The braking on the trailer can be adjusted by adjusting the gain up or down as needed and by setting boost to the appropriate level based on the weight of the trailer. It sounds like you either need to adjust the power higher, set the boost on or higher, or both. In order to do any of these, I have included a link to the installation instructions for you to...
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  • Gooseneck Hitch Recommendation for 1996 GMC Topkick Lo-Pro with 12Ft Bed
  • According to my contact at Curt, you could use the Gooseneck Flat Plate, # C65500, and mount it directly to the bed, assuming the bed is at least 1/4 inch thick steel, on your 1996 GMC TopKick Lo-Pro. In order to mount the flat plate to the bed you will need to use at least six 1/2 inch Grade 5 mounting bolts. By using this installation method, he can not guaranty the exact weight capacity but it should be close to 20,000 pounds. Since there are no custom rails available for your truck,...
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  • Measurements On Draw-Tite Trailer Hitch # 41952
  • The Draw-Tite Ultra Frame Trailer Hitch Receiver # 41952 measures 32.311 inches from the outside bracket flange to the opposite outside bracket flange. The trailer hitch has an easy, bolt-on installation with no welding required. It has a black powder coated finish that covers a e-coat base that offers superior rust protection., The trailer hitch has a maximum gross trailer weight up to 15,000 pounds and has a maximum tongue weight up to 1,500 pounds. I would recommend checking your...
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  • Hard Wire Brake Controller Installation in 2002 GMC Topkick
  • The Tekonsha Primus IQ Trailer Brake Controller # TK90160 that you referenced is compatible only with electric trailer brakes; it will not work with electric-over-hydraulic trailer brake systems. A better option for such trailers is the Tekonsha Prodigy P2, part # 90885, which will work with both electric and electric-over-hydraulic trailer brakes. My contact at Tekonsha advised that you should be able to tap directly in to the white wire at the brake light switch without any issues. This...
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  • Can a Brake Controller Fry an Electric Over Hydraulic Actuator
  • No, there isn't really a chance that the stock GM brake controller fried the HydraStar Electric Over Hydraulic Actuator part # HBA16 as it could not provide nearly enough voltage to do so. If you have checked the wiring then the issue is most likely inside the actuator. There has been problems in the past with the actuator getting too hot and frying the circuit board which is why they developed the vented model. The HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes...
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  • Recommended Tankless Water Heater Replacement For A Suburban 12 Gallon RV Water Heater
  • The best tankless replacement for your Suburban 12 Gallon Water Heater is the Furrion RV Tankless Water Heater - Gas - Automatic Pilot - 60,000 BTU - 18" x 18" Door Item # FR68SR. It has similar dimensions at 12-5/8L x 12-13/16W x 19-3/16D so you'll need to make slight alterations to your cutout hole to fill in the gap but the performance output of this unit will be worth the work. The on-demand hot water and ability to set the temperature to a specific degree instead of the old fashioned...
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  • Torque For Installation of Dexter Electric Trailer Brake Kit 23-180-181
  • According to Dexter, the torque should be between 25-50 ft. lbs. when installing the # 23-180-181. If you don't already have mounting hardware you'll need the Mounting Bolts and Hardware for 12" Brake Assemblies # BRKH12.
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  • Parts Needed to Wire in Brake Controller and 7-Way to 2000 C6500
  • Since we don't have a custom fit wiring harness for your C6500 what you'll need to do is hardwire in a brake controller that is compatible with your electric over hydraulic brakes on your trailer. You'll first need to start with a 4-way part # 119250KIT unless the vehicle already has one. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached...
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  • Does Demco 50-Degree A-Frame Trailer Coupler Bolt On
  • The Demco 50-Degree A-Frame Trailer Coupler w/ Jack Hole - eZ-Latch - Primed - 2-5/16" Ball - 21K # 12660-97SP does not have any bolt information, with the reason being that this is a weld-on application and cannot be bolted on. I did cut out the relevant aspects of the weld-on info that is from the manual. I also added a link to a video review of the weld-on Demco 50-Degree A-Frame Trailer Coupler # 12660-97SP.
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  • Dimensions of Reese Low-Profile 5th Wheel Trailer Hitch RP30054
  • According to my contact at Reese, their Low-Profile 5th Wheel Trailer Hitch # RP30054 has a base that measures 17- x 28-inches. The four mounting holes' centers are spaced at 15-inches front-to-back and 25-inches left-to-right. Do note that welding and possibly also some fabrication will be required when you mount this hitch to the truck's frame. A review video and the installation instructions are linked for you.
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