Help! My car will now power up at all it works with a starter jumper switch though. It will crank the starter but nothing... help!

These links may help:

https://www.askmehelpdesk.com/cars-t...tml#post235560

https://www.askmehelpdesk.com/cars-t...ml#post2123675

What kind of car do you have? You have to have fuel, air, and spark in a orderly sequence to get it to run. You'll need to dig a little deeper to verify what components are functioning, then proceed with that information.

TxGM has provided very helpful links, that I didn't notice before I added my answer. What he said... a very good read!