1991 teg alternator issues

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New Member
I have a 91 integra with a b16a sirII motor in it..

my alternator went out so i got a new one but not thinking about it, i got one for a 2000 civic si so the plugs dont match up.. i went to the junk yard and grabbed a obd2 plug off of an accord since i had seen that you can just splice the wires together..

i went to connect the new plug to my wiring harness but i only have three wires on the harness and there are four on the plug.

the three wires i have are: the OBD2 plug has four wires:
blue white/green
white/blue white/blue
black/yellow black/yellow

this is confusing me because i thought 1991 tegs were obd1 which have four wires but i only have three.. so would that mean i have obd0 wires? and would i be able to still splice the obd2 plug in or do i have to get a different alternator?