Dave750
Member
Hi everyone, I am new to the BMW previously being a Suzuki rider. Have bought a 2019 1000RR M Sport. Been advised to purchase a Optimate lithium battery charger which I have done so. The question I have reading the charger instructions is that it says If you leave the battery on the bike you connect the positive extension lead to the positive terminal (fine) but you don't connect the negative extension wire to the negative terminal you connect it to the frame, this is confusing me, why not connect to the negative terminal any thoughts you guys