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This page shows the standard pin-outs for 7-pin and 4-pin connectors plus various applications. You'll also find trailer wiring information on that site at etrailer.com. Go to their Wiring Adapter Fitguide page for your 7-pin to 4 pin adapter.
If you don't wan't to order on-line (and what with shipping, taxes and the state of our dollar) you may want to find a Canadian source. I presume you tried Cdn Tire without success. A good source might be an RV or truck dealer. There's a Lordco up in Prince George or you may have some other auto parts wholesaler up where you are. They have lots of catalogues and should be able to find what you need. You can also try Burnaby Auto Parts either using their site contact form or call them toll-free (note the free/cheap shipping within BC).
You probably don't want to hear this, but rather than use that expensive Volvo wiring harness and having to find a connector adapter, for a simple 4-wire trailer connection you could have used a cheaper adapter that you crimp splice direcly into the vehicle wiring.
There are two types of these adapters:
o A cheaper kind (maybe $10-$20) that is powered by the lights themselves. To avoid affecting the bulb out sensor you should run a wire up to the front brake pedal switch to get ahead of the bulb sensor relay, although some do it at the rear and just ignore the warning light. The rest of the wiring is all done at the rear. The big disadvantage with this type is that the trailer bulbs are only fed about 5-7 volts so they aren't very bright.
o There is a better kind of "powered" adapter (maybe $20-$45) fed with 12 volts from the battery so the trailer lights have full brightness. In addition to a brake light wire from the front (you can often successfully attach at the rear with this type without affecting the bulb-out sensor), you also need a 12 volt supply, either from the ignition switch (I would recommend against this just because it confuses trailer hook-up when the engine is often not running) or directly from the battery as will be indicated in the instructions. Some people get the 12 volts from the power antenna wiring at the rear (one wire there is always hot). The antenna 12 volt source is fine for most applications unless the trailer has side markers or multiple brake/turn signal bulbs on each side which might overload that circuit.
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Dave -940's, prev 740/240/140/120 You'd think I'd have learned by now
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