The Tamiya USA email, May 4, 2018, below.

The gun firing shut down problem is fixed!

I did not have the rear light harness hooked up to the “chassis control unit”. So, my fault, builder error, but no mention of that in the assembly and or ops instruction manual. Now we know though, LOL. Enjoy, John

Tamiya USA email:

Hi John,

OK, here's what we found, both your systems set and work as they should. Here's the big BUT, if you DO NOT have all the components hooked-up to the Chassis and turret control units the system will shut off when the main gun is fired, we believe this is a build-in safety feature. When we installed your systems into our runner tank and hooked up everything, both worked great. Once you complete the set-up in step 30 of the manual, I know it's tempting but do not fire the main gun. Both your systems are now set to your radio transmitter, all you need do is finish the kits, and do not fire the gun until everything is hooked up!

Thank you,

Gary
Tamiya America
Customer Service Supervisor