Use the jump start post under the bonnet. In my view much safer than connecting directly to the batteries in the battery box . For the earth use the lifting eye ring on the engine.I think I have to rephrase my earlier question a little more bluntly (and thus revealinig my ignorance): How do I help someone to jump start his car from my Grenadier? With the battery under the bonnet, that would be clear. But in the Grenadier, do I have to take the power from the battery under the seat (which means undoing the cover and all) or is there another, quicker way?