Can someon help I have no dash signals or tail lights but I have brake lights an head lights

I have a 1975 cadillac eldorado convertible all my fuses are new but only my head lights an brake lights, an hazard lights work. My signal lights, park lights an tail lights don't work at all what might it be thanks.

Park and tail lights usually work from Headlight switch, Signals go from fuse to Signal head.
Brakes and signals both go through signal head, usually.
And many times it is one filiment, (Stop/turn) lights.

Replace both dual filament tail/turning signal lights. They simply snap-out and snap-in the connector. Easy job. If the turning signals still don't work, replace both front amber-colored signal bulbs. Usually, the rear bulbs burnout first. It's a good idea to replace the back-up lights, while you have everything apart.

This link may help, even though I don't know what car you have:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-11.html#post2092806

Hey TX, is the brake and Hazzards same element? If Flashers work, shouldn't that say brake filiment is good? Thanks

Brake and hazzard element is the same. Yes, if the flasher works, it should say the brake filament is good.

You're good.