Starter replacement and location?

Hello,

Here is a guide that will help us do some testing and wiring diagram (Below) There is a starter relay that sound like it is bad.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please let us know what happens.

Cheers, Ken

Where is starter located on kia optima?

It is on the front of the transmission. Must take exhaust manifold heat shield off and you will see starter under exhaust manifold