Truck cap wiring question

[Hawken54]

I am hoping that someone can tell me which wire to use for my brake light. The 98 ARE cap I just put on my truck has a 3 pin connector for the brake light and interior light. My old cap used just two wires. The 3 pin connector is flat with 2 male and one female contacts. The female socket has a white wire and I am guessing that is ground. The other two are red and blue. Any ideas which one would be for the brake light? I don't really need the interior light right now. Just want to hook up the brake light.

The connector was made by Electrical Terminal Service. I can't find it on their site anymore though. The cap is a 98.

Thanks in advance for any help.

 

[mjw357]

My guess would be blue is the brake. The red is probably meant to be hot at all times. If it's wrong, just change it. No harm done.