When the key is turn to start the radio light goes out.
I replaced the starter, battery, batttery starter cable, neutral safety switch, iginition switch and checked the ground cables and fuses.

This link may help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post235560