Is there a OEM wiring harness available to plug into the Astro with 4 wire leads to connect to my brake controller? Or do I have to wire everything in from scratch. The Astro is prewired at the back with 8 wires(1 for the overhead stop lamp) so I am hoping that the brake controller will be simple to install as well.
The Astro comes standard with a 6 wire bundle, but if you have the 8 wire bundle (like in my own Astro) in your Astro, it just means that you have the optional GM trailer package. The 6 or 8 wire bundle is all you need to properly hook up a brake controller on your vehicle.
I've got a Tekonsha Prodigy controller in my Astro, and it's the best controller money can buy. I'm very satisfied with it.