I'm a little confused,
Your headlights worked before you installed the signals?
After the signal was installed your headlights and tail lights no longer work?
Question about your signals
Are your parking lights dual filament ?
Do you have 2 bulbs per housing in rear, one for the signal function, one for stop.
I'm not familiar with the signal stat 900, maybe someone who has installed one can advise.
Have you metered your headlight switch? Check the post on the switch as you pull the knob.
