just a clarification
Y/B = Yellow wire / Black Stripe
Y/L = Yellow wire / Blue Stripe
the alternator has a small yellow wire that goes from the alternator to a 7.5 amp fuse in your engine bay fusebox and runs from there to a solid white wire tied up to your 100a fuse also in the engine bay in slot A. in the usdm fsm the yellow wire branches off and goes to the smj on the driver side
in the japanese fsm a W/R wire runs from the alternator to the super multiple junction on the driver side to your cluster.
there is no yellow/blue wire that goes to the charging system in this area.
The idle air control valve is only 2 wires, should be black for ground and B/Y (Black wire with a Yellow Stripe)
that wire should be running to fuse 32 in your engine bay fusebox and through your super multiple junction from the fusebox to your ecu female plug.
hopefully that information helps.
you can download the fsm with the sr20 notchtop in it here. :
https://drive.google.com/file/d/11Vf...ew?usp=sharing
the page I'm referencing is EC-70 for the Idle Air control valve and EL-39 for the Charging System