It’s not uncommon to find unused electrical connectors inside the cabin and engine bay of modern cars. You may find, for instance, that your car is a mid-spec model with electrical adjustment of the front seats (which explains the two connectors that are wired up). But further up the range, there’s a more expensive model with, say, heated front seats that yours doesn’t have. But the wiring loom is the same in both versions of the car, so the connector for the heated seats is present in your car, but has nothing to connect to. If that’s the case, then this is very unlikely to cause a starting problem.

However, a lot of modern cars also position their computers under the seat, inside the cabin. If somebody has removed the seats or fiddled about down there and either dislodged or not reconnected a plug for the computer, then this could definitely cause all sorts of running and starting issues. If you’re still in doubt, most workshops should be able to identify what the connector is and whether it needs to be reconnected or simply left alone.

It’s rated to tow up to 1600 kg if what is being towed has brakes, so towing a van weighing 1000 kg on road should be a breeze.

There is a cooling-off period in Victoria. You have three clear business days from the time you sign the contract of sale to change your mind, but you automatically lose that right if you accept delivery of the car within that period. By taking it home your wife forfeited the right to the cooling-off period.