Just replace brake booster the vehicle will not start no electronics

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Hi I have a 1997 Mercury Villager I know you're busy I had to replace a brake booster on her I was driving all day everything was fine well other than the bad brake booster but it was driving just fine now so I got home and I got the brake booster from AutoZone I'll be placed it I took out the form holds the retaining clip to the brake cuddle unhook all the braking components and I'll put them both in there and I put everything back together and try to start it no lights or Electronics I have it until your turn on other than the dome lights no bending no problem the Clifton nothing like the normal sounds turning the van on but nothing happens I don't know what's wrong and I'm losing money because I'm a delivery driver please help anyone knows anything please please help