I've had several Yaesu mobiles, and while I don't know the 8900 specifically it seems logical that a straight patch cable (6P6C wires to same pins on each end) is what you need.  I lost the short cable for my FT-857 and made a new one, I have used both the stock cables in mobile installations and built longer cables for the same for my various Yeasu detachable head radios, they were all the same.

Jerry Buxton, NØJY

On 10/10/2018 19:39, Gary wrote:

Howdy Amsaters,

I sold a car and got the radio out, but left the cabling in as it was really in there....

            I need to re-create the cable connecting the control head to the main body of a Yaesu FT-8900r. It looks like an RJ12 connector on each end.

            What I don't know is do any of the conductors cross in the cable???

Thanks and 73, Joe kk0sd _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb