See what our Experts say about this Hopkins Flat Tow Wiring Harness

• Is Pollak 4-Pole Round Trailer Wiring Socket # PK11404 Compatible with Coiled Extension # HM47045
  Yes, the Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket, # PK11404, and the Hopkins Heavy-Duty Trailer Coiled Extension, # HM47045, are compatible parts. You can see a typical wiring description on the product page for the PK11404, under specs. White would be ground return, green is right turn and brake lights, yellow/red is left turn and brake lights, and brown is taillights. Essentially, there is no standard or agreed upon diagram of which function should go with which pin...
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• What is the Wire Gauge Used in Hopkins Heavy-Duty Trailer Coiled Extension - 4-Pole Round
  The Hopkins Coiled Extensions with the Nite-Blow such as # HM47045 use 16 gauge wires on the inside. Trailer wiring harnesses usually use 16 to 18 gauge wire for lighting functions and heavier wire for components that draw more amperage. On a 4-Way, you should have left and right turn signals/brake lights, running lights, and a ground so 16 gauge wire will work fine. But if it is for something other than lights then you would likely need to make an extension. We have jacketed 4-wire, #...
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• How to Wire Up a Tow Vehicle that has a Separate 6-Way to Tow a Vehicle with a 4-Way Flat
  The easiest way to do what you need is to convert the signal on your RV's connector to a combined circuit and then install a 4-way on your RV like part # PK11404 in place of the 6-way. For that you would want to start with a signal converter like part # RM-732. You will need to wire up the RV trailer wiring just like the label of the converter recommends. You'll notice that the running lights aren't mentioned on the label, that's because it bypasses the converter and runs straight to the...
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• What Is the Size of the Socket On the Hopkins Heavy-Duty Trailer Coiled Extension HM47045
  The Hopkins Heavy-Duty Trailer Coiled Extension part # HM47045 has two standard 4-round trailer connector sockets on each end which are both 13/16" diameter. This is more than likely what you have now as I am not aware of there being multiple different diameters for a standard 4-round trailer connector socket. That said, I can confirm for a fact the Pollak Heavy-Duty 4-Pole Round Pin Socket part # PK11410 will fit this extension harness.
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• Why Does the Hopkins Heavy-Duty Trailer Coiled Extension with Nite-Glow Flash With Turn Signals
  I spoke with Hopkins about the Hopkins Heavy-Duty Trailer Coiled Extension part # HM47045 and what you are going to need to do is test the running light wire just before the connector. If you get a pulse signal when the turn signal is applied then you have an issue with the vehicle wiring but if not then the extension is bad and will need to be replaced.
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• 4-Round to 4-Round Tow Bar Wiring Cable
  I have a couple of options that might work for you but we don't carry just the cord from part # RM-98164 on its own. Instead we do have part # RM-1064-B which doesn't have either connector on it. We also carry part # HM47045 which is the same type of cable, 4-round to 4-round, but obvioulsy isn't the blue Roadmaster cord.
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