Power window/lock/mirror failure

I have a 95 Chevy G30 van. The power windows, power locks, and power mirrors stopped working when I installed an electronic trailer brake controller. I disconnected the controller. The circuit breakers are fine. Where do I look next?

did you check the fuses?

Check the fuses in the panel under the hood. You have most likely blown one of the fuses in there. If all the fuses are ok then a common power wire to those areas has become open.