I'm trying to figure out what hooks up to each of these connectors. The green circled one looks like it is supposed to have a fuse in it, but I could be wrong. It has green and lime green wires running to it. The yellow one is for the under dash map light. The red circled one is just a single off-white wire that runs to it.

 

that may be your stock ac delco speaker connecter on mine had grn/wht on passenger side and brn/wht drivers side

 

the green circle looks like a spkr connection, the yellow and red circled looks like the doors pin switches that turn on the dome lights....

 

I know this isnt the proper place to ask about heater core removal, but I am in Australia and my 84Z28 is right hand drive. I find it necessary to pull the dash away from the firewall or pull it completely. Can anyone please tell me how I might do this job? Thanks for any help. p/s I have tried the other techniques on how to remove the cover to the heater box but with no luck.

 

Try a search, there were just 3 threads on the core and dash removal... Peace and goodluck