Where do I connect the heat attacks to the 450 l? Oil soups out

Hello, since recently I have a 450 L Bj. 87 and have attached heating handles. A own fuse is dragged into the line. I connected it directly to the battery lines. But I would much prefer the power for it would turn on and off with the ignition to prevent a discharge of the battery, if I forget to switch off the heating times. Can someone tell me where a corresponding line is. At the car it would be the terminal 15. I am not yet with the The cylinder head is completely oiled but the previous owner has renewed the valve cover seal. Can it be that so much oil is pumping through the camshaft rubber seals? After the oil change I made, it also soups out below. But the seal from the oil filter lid seems to be sitting right. Maybe someone has an idea about it. Greeting Freedom Star