# 1
Pollak HD, 7-Pole Round Pin Connector w/Cable Guard
I bought this as part of a rewriting project for my 77 Airstream Tradewind. What can I say - it works and it was easy to install. I've never made one of these before but after following some instructions online my problems were all fixed and I had lights and brakes. FYI, if you are using this for a 77 Airstream like myself you will need to connect the wires from the tow vehicle to this connector according to color with three exceptions: The yellow wire from the tow vehicle goes to the black connector on this plug. The black wire from the tow vehicle goes to the blue connector on this plug. The blue wire from the tow vehicle goes to the yellow connector on this plug. If the above doesn't make sense to you now (like it didn't to me) it will make perfect sense once you have this item in your hand. One more note about my installation - I had two problems that I was trying to solve with this. The first is that I had an "SH" meaning a short circuit in my brake lines. This same error showed up no matter what tow vehicle or what brake controller was connected. The second problem is that my running lights would not work on my camper, however when you connected my camper to another tow vehicle using my old 7 pin plug the lights did work. Strange, but we verified that the problem was not in my tow vehicle so the only option would be this 7 pin connector was somehow not working correctly. For what it's worth, the running lights would work on a 1999 Suburban and a 1997 Tahoe, but would not work on my 2004 Suburban. Anyways, I figured that I would at least try to use this item to make a new connector before taking it in for service and lo and behold once I got everything hooked up it all worked perfectly (the brakes and all of the lights now work). I couldn't be happier.
We had a truck that had a male side of this particular plug. We also had a trailer that needed to be wired up with the female side. etrailer had the parts we were looking for. Purchase was easy and the part fit nicely. Wiring was simple we just printed the PDF file easily found online. We did have to do some simple trouble shooting as our old connector had a 5 wire system but we figured it out. We've bought other trailer items from etrailer and have always been happy with fast service and fair pricing.
# 2
Pollak Trailer Connector Adapter - Vehicle End - 7-Pole Round to 7-Way Blade
I received this item in a plastic bag, for a few moments i wondered if it was a knock-off. I had done my home work and was sure that this item would be compatible with the socket on my John Deere 2013 5085M at the time I ordered it, not so. The 'holding ridge' at the plug-in end was not in the right position when fully inserted into the plug on the tractor. I sent multiple pictures to Pollack Technical Support but they were unable to assist me. I finally modified the item myself (something I really hate to do) so that it would fit the plug-in and be 'grasped' by the cover/holder on the tractor side. As I anticipated, the thickness of the plastic was inadequate to make the adaptation 'sweet', so I had to cover the resulting hole with silicone caulk.
This is a great solution for adapting RV blade connector to 6 pole connector. I give it 5 stars. I use this for work purposes, and have found one issue that I DON'T believe to be manufacturer defect. In my industry we use different trucks and trailers daily, if not hourly. Some trailer electric brakes will lock up when adapter is connected. I have found the red wire in the adapter to be the problem. My solution was to splice in a switch so that when the intermittent problem arises I can flip the switch and be on my way.
# 3
Trailer Connector Adapter for Land Rover - 7-Way, Round Pin, European Style to 4-Way Flat
Great build quality, but unfortunately it will not work to legally use a 4-pin trailer being towed by a 7-pin Euro/Land Rover plug. Its simply mapping 4 of the 7 pins to the following pins on the 4-pin side. Left running, Right running, Stop and negative, there is no provision for indicators or dual sided brake lights. It needs diodes (which it does not have) to do this. etrailer just needs to update the description as this is a good basis to make various adapters.
Received product in good order, well packaged, initial some delay, manufacturer was chased by etrailer, and earlier dispatched by manufacturer; delivery trail clear stated, very good. On receiving verified at UHAUL: connect with 1983 Land Rover (Defender) 110 Stationwagon (photo: rear, while on transport): all functioned ok. Apparently some diode(s) included, as the 7 pin has individual stop light which translates as left AND right indicator on flat pin. Emergency flashing (all indicators left and right) tested ok at UHAUL (connecting to trailer). LR has European homologated 3.5 metric Ton (7700 lbs) tow hook and has done some 60,000+ miles towing with current odometer reading 578,000+ km (on/about 360k miles)
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