Crank no start issue

Hello,

Just to clarify, when you try to jump start the vehicle, the engine will crank but not start? Or is it just making a clicking noise?

If it just makes clicking noise, then it could be a wiring issue from the battery to the starter or a bad starter.
First make sure that the battery cables are clean and secure. Check the cable to the starter as well.
It would be a good idea to replace the battery as you know it is weak and possibly bad.

https://www.2carpros.com/articles/how-to-replace-a-car-battery

If you are still just getting the click, then the start is likely bad and needs to be replaced.

https://www.2carpros.com/articles/starter-not-working-repair

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.