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

Many states in the U.S. and provinces in Canada require break away kit. In order to determine the specifics for where you live and where you plan to travel, you can check with the state and federal departments of transportation for the area. Specific…

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Answer 5

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 6

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 7

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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Answer 8

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 9

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Answer 10

No, but your local and state laws may require one. You will need to check anywhere you will be towing the trailer to determine if a breakaway system is required by law. They are also just a good idea in general because they will stop a run away…

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Answer 11

The wires that are routed through an axle, like the etrailer.com #e43SR, are there to connect electric brakes together (see included picture). You do not have to use them if you prefer not to, but as they are more protected than an exposed wire, it…

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Answer 12

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

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