My serial number is cat0289cvjmp02372. I looked at the electrical schematic on my service disk but it shows different colors than what wires are on my radio. Could someone help me out please?
That's because you're not interpreting the schematic correctly.
1) The colours shown on various wires on the illustration are generally NOT the same colour as the insulation on the wire itself. The colour on the illustration indicates what the wire DOES. Look in Grid B-1 on Page 2 of the schematic and you will find a table listing all the various options.
2) The wire number and colour is shown in text in the schematic illustration. See the snip below which is taken from the schematic for your machine. That is the connector in the machine, not the one in the radio.
So for the first wire at the top 509-C70 WH 18
Wire Number is 509 - This number will be marked on the outside of the insulation every 6" or so.
It is wire #70 in Harness C (refer to table in Grid C-1 Page 2 for harness Part Numbers & function)
Colour is White (WH). There is a table of 2-letter colour references in Grid A-4 of Page 2.
Wire Diameter is 18 SWG.
The numbers 1 to 8 right next to "CONN TO RADIO" are the pin numbers of the 8-pin connector. You will find them moulded on to the back side of the connector.