07 head with external siren control box.

We only use it to control the siren. Our lights are on the old moto wildcards.

It's definitely urc, not urd.

Hello, We recently installed several APX 6500 mobile radios. Many of them are giving a "urd hw error" upon boot up, and several cycle on and off several times before they stay on. The wiring is sound and these were replacing astro spectra mobiles that had no issues.

We are in Wisconsin and it has ...