Hello, I want to retrofit a radio remote control to the existing ZV on my 850 (Bj. 96). Now I just don’t know if the ZV is ground-controlled or plus-controlled, depending on the two cables are hung either on plus or on mass. Can someone help me? Thank you already. mfg Frank PS: I already have the instruction from Svobi, have also found the cables in the glove compartment as described there already (must be the ones that come out of the door?), have also attached to the ZV on/to-cables a current tester, that lights up when the ZV is activated NOT. Can I then assume that it is a mass-controlled ZV?