No power

WHAT are we working on?

DOES it use factory wiring, or has it been rewired "Painless," etc?

I ASSUME the battery is in the front and not in the trunk?

Not having headlights is one of the first things that is "tapped off" of the main battery feed, so it's strange that you have hazzard flashers and nothing else.

Wiring 101

CLEAN the battery terminals and cable ends. I know they are new, clean them anyway!!

Get your test light (or meter)

Turn on the headlights.

Clip the meter to a BODY ground (NOT the engine) One place is the brake lines coming out of the master cylinder.

Put your meter on the battery post. Voltage?

If OK, put your meter on the start relay battery stud. Voltage?

If OK, re--confirm that the hazards are working, turn them on and re--measure..

Did the voltage at these two places go down? (Should not if OK)