project84 (rahn)
+1y
I can help you with this one.
Most every head unit for the last umpteen years have the same wiring harness colors.
RED: 12V Switched ignition source
YELLOW: 12V continuous (always has battery power on it to save your clock and presets)
BLACK: A good ground
BLUE: Sometimes referred to as the power antenna wire or the remote trigger wire.
If you are not using the speaker outputs on the head unit, tape the ends of those wires so they cannot come in contact with anything metal. This will short the outputs on the head unit. Should you ever decide to re-use this unit with its on board power you don't want to short these.
The most common way to hook up an amp is to run a pair of RCA's from the back of the HU (head unit) to the amp (red to red and white to white). Next you will have to extend the BLUE wire I talked about previously all the way back to the amp.
To power the amp you MUST run a sufficient gauge wire to the positive side of the battery, terminating it at the battery with a fuse equal to the size of the one in the amp. You can ground the amp on a seat bolt most times with good results. THEN you run your speaker wires from the amp to the speakers.
Clear as mud?
Just think of it as a waterfall kind of, with the head unit being the top of the hill.
Here's a link to a decent diagram:
PM me if you have any further questions!