Can any body please tell me what the 4th skinny plug is on the back of the factory hu? I am swapping out the delco and my harness adaper kit came with the extra (power?) plug, which the new deck doesn't have, should these be paired with something in the 12 pin harness? :?:

Thanks, admitted noobski

Sure..

You need to tell us what year and model of car you have first..otherwise..we are shooting in the dark.

What year? Post your year and trim in your signature, otherwise we have no idea what you are talking about.

92-99 right?

dont worry about it, as far as I know, only 3 of the 4 plugs are used

its an 87 by the way

model 16066992 delco, 87 bonneville le

Ahh, then you have the old style plug on the 87. If you are talking about the small 2 prong one, yes it'* the power for the radio.

the harness has what looks like a +/gnd etc in the black plug, i hooked up w/o the odd plug but no power, deck was benched

power JUST for radio or all?

Im unclear as to whether i should splice into power on blagk plug, i cant NOT use black plug (rem,acc)