I have a TAO TAO ATA110 I had to replace my ignition sense I lost my factory key and remote. Sense replacing it I have no power at all when the key is in the on position. Fuse and Battery are good. I don't know what it could be.

 

Make sure you have every wire right. Didn`t lose an earth anywheres?
Check your battery again. Strange but it happens.
Start at the start mate.

 

So did you replace your ignition key or remote box or both?