Don't take this as gospel, but I've heard another way with modern cars where the jump leads have no surge protector thing is to make sure headlights are on for the car giving the juice

Some1 on 'ere is gonna refute this for sure!

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MY99 WRX sedan WRC blue Sold :(
MY99 WRX sedan Dark blue pearl :D
MY97 Liberty Outback Ltd Wagon
1990 Mk3 Supra turbo fully rebuilt 7M-GTE (Older son)
1991 Celica GT4 (Younger son)