Freds 73 Scamp restore on a budget

I remember something weird with the nss and backup lights. Like reversing the plug made a diff.....Or I had the "wrong" bulbs in it that looked similar...but were wrong. Something dumb.
I think it is something simple to fix but will figure it out here soon I hope.
Thanks for the great engine I am real happy with it and will send you the video of the first start up if you want it.