Zx10RE8F lights head lights not working...

[yorkie]

Let me guess, you cleaned the regulator plug contacts and the solenoid plug contacts, and battery terminals.

I'm not sure on your bike as I don't have the wiring diagram, but if like a few kawasakis the headlight relay also uses the starter solenoid and a diode to work using voltage drop over each, so if you have poor contacts in the above items then you generate to much of a voltage drop and the headlight relay will not trip and hold on, as its sensitive to voltage.  I chased up a similar fault on z750, that can be found here http://www.bikersoracle.com/zx9/forum/showthread.php?t=17633 It has the relay diagram which I would assume is the same for most kawasakis using the relay box.

[Jimhas7]

Yep sounds about right, just cleaned connectors, been fine since.