Troubleshooting 7-Way Trailer Connector Does Not Have 12 Volt Power on a 2010 GMC Sierra

Question

Question:

2010 seria 1/2 ton 7 prong plug has no + battery power going to trailer battery

asked by: Jerry

0

Expert Reply:

The first thing you will want to check is the pin on the front of the 7-Way that is in the 11 o'clock position using a circuit tester like # PTW2993. If it is not showing a signal, then it could be that the 12-volt hot lead is not connected at the point under the hood.

The wire you will need is red/black and has an eyelet connected to one end. It is coiled up under the master cylinder/brake booster assembly and must be connected to the under-hood fuse box. The battery charge wire will go on the larger stud just forward of the power distribution box, and an M8 metric nut, # 185917, is required to attach the wire to the stud.

Important side note: raising the gray handle above the studs more than 3/8 of an inch will result in the fuse box becoming disconnected from the electrical connector. If disconnection occurs, you may have to consult your local GM dealership for repairs. I have included a link to an FAQ article that should help.

expert reply by: Michael H

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Answer 1

On this page (typically below the product links) there is a helpful link section that will have the install instructions fo the Hopkins Breakaway kit part #20400 that you referenced. I also attached an install video that shows the kit installed as…

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Answer 2

There are a couple reasons the 12V hot lead pin may not have power on your trailer connector. The first thing that you will want to do is to check to make sure that the wiring for the power is actually plugged into the battery power. This is…

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Answer 3

Though there is not a diagram available I will list for you the functions of the wires in the junction box of the Epicord #277-000141. White = Ground Black = 12V power Yellow = Reverse or Auxiliary Red = Left turn and Stop Green = Tail and Running…

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Answer 4

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 5

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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Answer 6

A BT8 spindle would have a diameter of .99 of an inch where the bearings would both install and would have a diameter of 1.24 where the great seal would ride. That would require a hub part #AKIHUB-440-2-1K for an idler hub. A BTR spindle would have…

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Answer 7

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 8

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Answer 9

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 10

Depending on how the trailer was made, there will be a few spots you can check to identify the axle. First, if the trailer was pre-made by a specific company, you may be able to find this information in either the paperwork or on a placard somewhere…

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Answer 11

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 12

Traditionally, trailer manufacturers did not use electric brakes on boat trailers because the brake magnet wiring and trailer wiring did not always have the best insulation or water protection. These days, more and more manufacturers are using…

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Troubleshooting 7-Way Trailer Connector Does Not Have 12 Volt Power on a 2010 GMC Sierra

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