Dsmguy1993

So I have a rebuilt sr20det s13 in my car it runs good and I got the alternator to start charging the strange thing is even after I installed a new optima yellowtop and secured my battery ground by using one that fits the terminal very tightly, I notice that basically if I drive for a bit say 20 minutes then shut the car off and come back like hours later it doesnt likee to start, but if you start it up right after shutting it off it starts up perfectly! So my positive battery cable connects to the fuse box from there a 4 gauge wire goes to my alternator positive post and from my alternator theres a 4awg wire to the starter and on the starter is my harness constant 12v (wiring specialties pro harness). So do you think its having a hard time initially cranking and only crank easy when jumper cables are involved orr do you think my battery positive should go straight to the starter and only the alternator connects to the fuse box this way the starter gets direct power? Thanks for any help btw my sr runs good otherwise afrs are looking good the starter receives constant 12v ive seen it with multimeter it cranks up perfectly when jumper cables are used btw.