99 Honda Accord had a problem with the electrical side of the ignition switch. I disconnected the positive side of the battery while installing the new electrical side of the ignition switch, and connected the battery, now the lights on the dash don't work and the car won't turn over. Horn works, head lights and interior lights work. And key inserted beeps. No dash lights, car won't turn over, no radio, no blinking lights on after market alarm. left/right blinker doesn't work.

 

I moved your thread from the DIY section, that section is not for help questions.

Welcome to the board.

Is this a 4 or 6 cylinder?

 

The fuses for the dash, turn signals, and radio only receive power when the ignition is ON or START.

Double check that the ignition switch harness 6-P connector is securely attached to the driver's under-dash fuse/relay box. If that is okay, then double check the installation of the electrical switch.

If the switch installation seems okay, then check the No. 42 (50A) large fuse in the under-hood fuse/relay box. This fuse feeds power to the wire going to the ignition switch.

 

This is a 4. Thanks for moving from DIY to help area.

 

So was it the fuse? Did you get it to start? I just replaced my switch and the same thing. No,start, no dash light. 1999 honda accord 4cyl. I heard it may be some sort of security block....

 

Have you tested the items that redbull gave the OP?