The Load wire is always hot (black or red wire) and the Line wire is the one that returns to your fusebox (usually white).
Answer above is absolutely wrong written by someone who does not know electricity and will get you electrocuted. The white wire is your neutral wire. The black or red coming from the electrical panel is the line wire. the black or red wire going to the next outlet or light fixture is your load wire. in some cases a white wire will be a line or load and should be indicated with black tape on it denoting it is not a neutral. quick recap is Line = power in, load = power out.
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Don't know the color of the wire but you will just have to use a test light to see what wire is hot to the radio.
Go to Public Library and request GM Electrical Shop Manual for 1991 Park Avenue -- librarian will help you locate it. Has complete diagrams and dianostics. Might want to check Fuses #12 (20 amp) and #7 (25 amp) Too involved for detailed explanation, but there are 3 components: the compressor, the load sensor (at right rear spring), and a relay (in the RELAY_CONTROL_CENTER (behind the glove box). The YELLOW wire from the sensor pulls the relay which applies power to the compressor thru the BLK/LT GRN wire at the compressor's connector. The BLK wire at the compressor's connector is the GRD., the BLK/PPL is always HOT (thru fuse 12), and the WHT wire (when grounded) releases the pressure in the system.
the answer is YES, use a test light to find the + and - wires (should be one ground wire and two hot wires [one hot all the time for your clock & one hot only when the key is on]) in order to find which speaker is which, use a 1.5 volt battery to make a popping sound in the speaker (won't hurt the speaker) and then the solid color wire will be your positive & the wire with the stripe will be your speaker ground.
My Favorite Place to visit is Florida. It has the ocean and it is always hot.