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It's what you want from your radio!  Quality wiring gear helps to achieve great sound by ensuring an uninterrupted flow of electrical current and audio signals through a system's various components. Signal-connecting and power-connecting wires, along with their associated hardware, are as integral to the overall performance as any piece of electronic.  This is especially true in Agricultural equipment, given noise and interference, reliance on self-contained 12 volt power and a relatively harsh physical environment.
Select Tractor Brand to view table for your tractor radio wiring harness.
McCORMICK TRACTOR HARNESS radio wiring harness from Farm Radio Supply
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VIEW HARNESS PIC
McCORMICK
$30.00
NOTE:  The above harnesses have a D6 or ISO connector on one end to plug into the REI Radio. If you are installing a aftermarket radio in your McCormick  you will need to cut off the D6 plug to hardwire it to your new radio pigtail or look at the TRACTOR ISO INV version.  The 512231 is usually purchased with the REI Radio.

If you are install a aftermarket radio and your tractor needs the 512231 connector then use the "TRACTOR ISO INV" instead.  This harness has 6in length with bare wires that is designed to hardwire to your new radios pigtail. Better to use if you are not using one of the REI Radios and
SAVE $5.00 as well.  See below
TRACTOR ISO INV
Harness comes with wiring instructions to connect to your aftermarket radio
TRACTOR ISO INV
$25.00
The harnesses below represent the new models of McCormick Tractor.  If not sure it applies to your application, remove the radio and examine the connector.  Should consists of either a single plug divided into 2 sections that can contain 8 pins each or 2 separate 8 pin connectors that look similar.  Reference pic below.