Are you talking about the cables that run to the FT-237 radio mount, or the aux cables for the hand mike, headsets, etc.?
The FT-237 cables are about 1/2 inch in diameter and 8 foot in length, whereas the others are about 1/8 inch and are 6 foot long each. There is also a 12 inch cable that runs from the BC-600 Commo box located on the driver's left side that runs through the bulkhead into the hull that ties into the motherboard.
My brother & I spent over 3 years doing a 100% ground up FACTORY restoration on an 1944 FORD M-8 Armored Car that he bought as a basket case frrom a Georgia scrapyard, so I managed to learn WAY MORE than I ever wanted to know about the M8-M20 series vehicles.
Hope that this helps you.
Thanks As Usual,
ABD
PS.. I have a few pics of the finished M8 if you are interested, either click below or send me a PM or E-Mail.