Post by
centralcoaster33 »
https://forums.nicoclub.com/centralcoaster33-u27573.html
Wed May 11, 2005 10:27 am
First off, it looks like your pretty close to identifying all the wires and your guesses all seem correct. Blue/White could be the rem/power ant. wire for amplifiers available on some models (but I’m only guessing at this one).
Using a volt-meter: A continuity test with the speaker wires should help identifying the pair of wires for each speaker. When you find a pair, the speaker will make a static sound. Next, switch from continuity to DC current 0-50. If you are unsure of the ground, use the chassis until you’ve narrowed down you options. Be careful not to test power wires to each other as this will typically blow a fuse. With the car on, verify Red is power by testing against the chassis. Then verify Black is ground by testing against red (unless red is not power). Note: with the car off, red should have no power unless it’s the memory wire. With the car off, verify Yellow against Black (or chassis). With the car on, turn on and off your headlights while testing the Orange/White wire to Black (or chassis) for the dimmer switch. Yellow is typically constant power (memory) and can be tested against black while the car is off. Orange might be the illumination or constant (memory) and should be verified with the Black ground and the car on or off or headlights on or off. If you still need help, I could explain this better.
Using a store: Go to Circuit City, Good Guys, or similar, ask about a wire harness. Ask to look at the package. The package typically labels all the wires and uses standard colors. Write it down or draw a picture and compare back at home.
PS. A wire harness at $10-$15 each seems expensive. Needing two seems ridiculous. The time saved and the quality of the connections (as opposed to bent wires and tape) makes the cost worth while, especially if you ever plan to change cars or head units.