You aren't getting any suggestions because 'replacing all the electrical' means you also replaced the wiring going to the taillights (which has no effect on whether or not your car will start).

Start off by telling us what you really replaced and try to give us more insight.

Did it stutter, then die? Do you have any aftermarket mods you recently installed? Does the car lurch forward at all? Have you recently installed any aftermarket electrical components (radio, alarm, gauges, kill switch)?

Just break it down, man. We might be able to help if you explain more in detail. Even if it takes you ten minutes to type and a half a page of reading. In that case, use your punctuation and grammar as if you were a 65 year old English teacher so you can be as clear as possible with us.

We do want to help.