![]() ![]() It is usually used for towing heavy-duty cargo trailers, aluminum trailers, dump trailers, utility / landscape trailers, equipment trailers, open car haulers and enclosed car haulers. The 7-Way Trailer Plug is around 2″ diameter connector that allows an additional pin for an auxiliary 12-volt power or backup lights. Trailers with electric brakes need them too. Most new vehicles equipped with a tow package have connectors. Images and text may be copied, provided a link back to the copied page and the source is displayed where the content or image is located.It’s the dreaded 7-Way Trailer & RV plug that we all have come to know and love. Initially, a robust connection will occur when a north polarity magnet is attracted to a south polarity drum or visa versa. Note: Brake shoes are not damaged during polarisation.įinally, an alternative is to interchange the wires, to reverse the magnet polarity. The remedy in the past was to change the polarised drum for a brand new drum. In this case, the tow vehicles brakes provide most of the braking power. Slow brake response is also a symptom of polarisation. When the magnet re-engages, it will repel instead of attracting onto the drum face. In this case, the drum face is magnetised to the same polarity as the magnet. The drum face can become polarised accidentally if the brake magnet is engaged by say a breakaway switch for a period of more than 15 minutes. By looking at the cables, one cannot tell the correct polarisation. The connection of 2 wires determines if the magnet surface has a North pole or a South pole. I will write more on this subject in a few weeks, but here is a brief overview:Ĭaravan Electric Brake Problems Simplified What if changing the cable does not work?Īt times, changing cable may not work due to a little know phenomenon known as drum polarisation. Area= Cross-sectional area of copper in square millimetres.Length= Total Length of wire in metres (including any earth return wire).Voltage Dropįor those of you that are technically minded and wish to calculate voltage drop in a copper wire, use the following formula: Use 14 or 13 AWG for the ultimate braking experience. Is 15AWG of sufficient Size for my tandem trailer? Is 17 AWG or 1mm cable sufficient Size for a single axle trailer?Ī 17AWG almost gets it right with correct voltages, however, if you upgrade the cable to 15AWG you will feel your electric magnets come back to life. Two sizes are identified in the chart below The 1.13mm nominated is the actual cross-sectional area size of this cable. The 3mm is not the correct size of the wire. Narva advises the 3mm Size of this cable in this photo is a stock number only. To improve caravan electric braking systems, start by measuring the cable size (copper size) of the electric magnet, it is 1.15mm diameter or close to it.Ĭaravan braking and camper trailer braking are all improved when increasing cable size. This comparison chart below removes a lot of confusion. Electrical Outlets use the cross-Sectional area calculation method. ![]()
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