DBSnappa wrote:
I’m sure most of the time nothing will happen if you connect to correct terminals. It’s more that modern cars are complex electronically and you can fry expensive bits of circuitry if you’re unlucky. Last time I looked, the recommendation was to run heaters, lights, radio, engine etc on the healthy car, and connect the negative clip on the receiving car to a metal part of the engine bay, not the terminal.
I mean, yes I'm careful to connect to the appropriate terminal (or sometimes the bit of the body that the negative terminal is connected to, if that's easier to reach), and not to let the clips touch each other, but other than that I never remember which order to put them on and take them off and while I've heard about running the fans and that I've never bothered.
The bag the jump leads came in has a warning about cars with electronic control systems (but that's pretty much all cars innit?). Are they just being cagey with their disclaimers in case of those rare/unlucky events?