WHats this plug connect to? FOund it under washer fluid tank

You might want to make sure there aren't any adverse effects to the lighting circuits if you cut the harness. The cap is actually a shorting plug that connects two of the circuits.

I have that plug on my 91... however my buddy's 89 does not .... what is the difference between those 2 years?.... Airbag! The connector acts like a spout connecting 3 cicuits and there are 3 airbag sensors.. I cut mine out the other day haven't noticed any adverse affects but the car is apart getting twin T04Es so I haven't driven it.