I have to wonder if the 97xx series JD uses a different type of radio that isn't affected by the HID system.
It's certainly a different radio, but I think it's more to do with the quality of the lights. Pretty sure the HID's that JD use would cost 20 X more than the ones I've put in
. I don't remember exactly, but the HID lighting package (5 lights) was something like $2,500 on my last tractor quote. You would hope that you'd be getting a superior product for that kind of money!
As you've suggested Transaxial, I've put in more heavy duty wiring to run extra lights, and the JD ATU autosteer which is fairly sensitive to voltage drop, but HID kits can get by without this, because they only need full voltage to get them started - once started, they use a less power, and reach full brightness without issue.
I did some testing on a batch of 55w HID kits years ago. With a 14.4 v power supply, at startup they draw 5.7 A, or 82w. This ramps up to maximum draw of 6A after 7 seconds, then it drops down to be stable after 20 seconds, drawing 3.6 A, or 53 w.
I admit that heavy duty wiring would certainly help the issue of lights not starting up, but given the choice of flicking a switch on the occasion one doesn't fire, or re-wiring the lights, I know what I'd do.
The other interesting thing is that HID's seem to use the same amount of watts regardless of voltage. If voltage drops, they draw more amps. The fact that 6 can run together on a 9600 without ever tripping a breaker, indicates that they are able to reach full power, and full brightness, so extra wiring isn't necessary. No need to complicate things.
I've done a couple 9600's, a 9500, CTS and 9760 all on factory wiring, and they all work fine other than the odd occasion one globe doesn't fire first time, and the radio interference issue. All owners are very happy with the upgrade.