You may think the rubber caps protect the plug, but they tend to hold the water in. That is the green stuff that forms when oxygen from the air or water comes in contact with copper. A thin coat of grease will help prevent copper oxide from building up. ![]() The ground wire should be large enough to handle the entire load do not depend on grounding through the ball. Make sure your ground wire, which is typically white, is securely attached to the frame on both the truck and trailer side. Keep in mind that it isn’t always as simple as matching the colors like you might be inclined to do. Having the wires backward will cause problems. When referencing the 7-Way RV Plug diagram, make sure you are looking at the plug the way the diagram is showing you. Download the guide below, print it and keep it in your toolbox for future reference. We are going to do our best to simplify that, mainly with a good, color coded diagram. If you’ve ever looked at a 7-Way RV Trailer Connector, you have probably stood there scratching your head in confusion. With all the abuse and day-to-day wear and tear, you may find yourself repairing or replacing one sooner or later. Here at AJ’s, we are all too familiar with the accidents people have with the plugs: forgetting to unplug and pulling away, dragging it on the ground. 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. I'm sure most, if not all this info is here on mud already, it may be just a matter of finding it.It’s the dreaded 7-Way Trailer & RV plug that we all have come to know and love. With that said, with enough patience and a DMV/Ohm meter, you should be able to figure out each wire without taking it apart.īTW, I believe that the ignition switch is a separate connector and has 4 wires. ![]() I would take the plastic covers off the column, and remove the steering wheel, so it gives you a better idea how the wires are routed and therefore where the wires are going, like ignition switch, turn signal switch, etc. One thing I've noticed working on a few cruisers is that the color on the OEM schematic is generally showing you what color wire is being used in the OEM main wire loom only and when that wire runs to a connector, like on the steering column, the mating wire for that terminal could be a different color. It sounds like you don't have the OEM loom and are using a Painless harness. Just a bit of caution about the wire colors I listed above, those colors were from the schematic showing the color of the wire in the main loom. The GR (green/red stripe) could be the horn. WB (white with black stripe), I think, is only used for ground so that would be a good guess. I will do more searching and try and find it again. I do have a sketch of the electrical connections from another thread that I now can't find, showing the the connections in the turn positions, but the wire colors are not labeled, and I don't know how to read it. I have the wiring schematic, but it doesn't show the 2 or 6 position plugs or the pin out of the column like it does for the switches. With the lever in the center position, I get RY to RW (also in right AND left turn position)Ĭan anyone help with what wire color does what or how to test to see. With the left turn signal on I get GW to GB and RY to RW With the right turn signal on I get continuity with GY to GW adn RY to RW 1978 steering column wires and how they ring out. This is something I can't seem to find on this site, so hopefully I'll be the first, but not last to do this. I'm going to be asking questions and documenting every wire # and every switch wire color and when I'm done I will do a separate post and run down every connection I did so future members can just follow along. I'm going to start with the steering column and hazard switch in this thread, then do another thread about the others. My plan is to write down every wire # (painless wire #) that goes to each switch wire, then install and hook up the wires. ![]() Long story short, I am so confused I can't see strait, and I haven't even started. OK, so i got a set of 78 switches from another MUD user, and am now ready to start.
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