Both fans are suppose to run at the same time. You more then likely have a bad fan motor. One way to check is run a fuse 12V line to the motor with a ground. If the fan runs then you have an issue elsewhere. If the motor does nothing then the fan motor is faulty. Make sure you use a 10 gauge wire for testing.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Life is a hard teacher, it gives you the test before it teaches you the lesson.
The Human race is governed by it's own imagination.
Please don't steal, the government can't stand the competition.