What is Function of Black Wire on Trailer 7-Way part # HM20048

Question

Question:

Just purchased 7 way trailer harness. What is black wire for?Looking at your on line diagram there is a purple wire for back up lights but i dont see black.there is no purple on this harness. Hm20048 item number

asked by: Dave W

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Expert Reply:

The black wire of the Hopkins 7-Way Molded Trailer Wire Connector # HM20048 carries the 12 volt accessory circuit. This is the circuit that will typically power interior lights or charge a trailer's battery.

I attached a help article that covers trailer wiring for you to check out as well.

expert reply by: Jameson C

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Answer 1

The Progressive Dynamics PD9200 Series Inteli-Power Converter - 12 Volts - 45 Amps #PD9245C is 8-1/4" long x 7-1/4" wide x 4-11/16" deep. If this fits in the slot you are referring to in the bottom of the power panel then you will be…

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Answer 2

The Progressive Dynamics Replacement Section #PD4655V does have a jumper to change the charging profile to lithium compatible. You'll simply need to move the black jumper over from the WIZ side to the LI side.

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Answer 3

The spindle dimensions are as follows: A is the mounting dimension, B is the seal dimension, C is the inner bearing surface, D is the outer bearing surface and E is the diameter of the threaded portion of the spindle for spindle nut selection. Say…

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Answer 4

Typically, the black wire is 12-volt power, and the red wire is left turn/brake lights. But you cannot always go by color. If the wiring in question is on the trailer side, then there are two ways to determine which color wire does what function. You…

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Answer 5

If you are referring to two white wires from the brake magnet that are coming from the rear of each electric brake assembly, then it would not matter which wire is connected to ground and which wire is used for the brake feed. The magnet that…

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Answer 6

You have a good plan! You are correct that once you have a functional 7-way connector and the Tekonsha Prodigy P3 #90195 installed in your truck that you will not need any other wiring on the truck. Going with a junction box like the #38656 to…

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Answer 7

The etrailer brand axle #e32GR is pre-greased using a lithium complex multi-purpose grease like the #DX64TR.

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Answer 8

We definitely have what you need to add electric brakes to your trailer. I spoke with Dexter to make sure I recommended the correct parts for you, and the spindles that were used on your 2,500 pound axle is actually the same one used on the very…

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Answer 9

No, if the breakaway battery on the trailer is dead and the pin is pulled out of the switch then no power would be sent to the trailer brakes and they would not lock up. If they do lock up then the brakes must be getting power from another source or…

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Answer 10

You can definitely ground your trailer brake assemblies to your trailer frame. This will be just as effective and also will be a much easier install.

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Answer 11

The Dexter D35 axle is a 3,500 lb trailer axle so for a bearing kit you would want the part #BK2-100 that you referenced.

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Answer 12

Red lithium grease such as #L11390 is one we use often here for installations and it is compatible with other Lithium formulas. I have included a link to our help article that covers grease compatibility. There are greases that are not compatible…

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What is Function of Black Wire on Trailer 7-Way part # HM20048

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