replaced the starter and now it makes the sound like the selenoid is not engaging

You just getting a clicking sound without engine turning over?

...okay there is a big fat cable...it's a 1/0awg Battery cable...this one clamps onto the battery on one end...but the other end is connected to the chassis ground...what you must do is get a coarse wirebrush and undo THIS connection...wirebrush till clean, both lug and landing zone and re-assemble without corrosion...*for now~

If so check battery voltage. Also check all battery connections to make sure they are all tight and clean. Also check negative cable on frame and motor to make sure they are also tight and clean.

this will restore the necessary amperage...OOOO just remembered the connection to the motor block too...near the alternator too~

'''beat me too it dan-dee~

thank you so much it makes perfect sense now. I will let you know how it turns out. bless you