73 240z rear defrost only works with headlights on

[Shawninvancouver]

it wont work unless head lights are on.  once headlights are tuned on the rear defrost will work.

any idea where to look?? any idea what may cause this??

help!

[dutchzcarguy]

Oh.. that's simple... your power to the rear defrost has to come from the right fuse.. apparently your defrost is now on the line after the lightswitch.. whats not correct!

Take a good look at the 240z schematic and look at where the defrost is connected to the power..