Why no electrical on my 91 nissan maxima after changing battery - won't start no lights - no nothing

. Check all under hood and under dash fuses with a test light or multimeter:

https://www.askmehelpdesk.com/cars-t...tml#post252145

Be thorough, since it will save a lot of time and money. Likely, you blew a mega fuse in the under hood fuse box.

. Check ignition switch for wear, pitting, or melting, if the problem persists.