1986 BMW windows work no voltage to switches curcuit breaker been replaced there is but still do not If you jump window What wrong?

If there is no voltage to the window switches after replacing the circuit breaker, and jumping the window works, it is likely that there is a problem with the wiring between the circuit breaker and the switches. Here are a few things you can check:

1. Check the wiring harness: Make sure that the wiring harness between the circuit breaker and the switches is properly connected. Look for any loose or damaged connections.

2. Check the ground connection: Make sure that the ground connection for the window switches is properly connected. The ground connection is usually a black wire that is connected to the chassis of the car.

3. Test the wiring with a multimeter: Use a multimeter to test the voltage at the switches. If there is no voltage, then the problem is likely with the wiring.

4. Replace the switches: If the switches are not receiving power, then they may be faulty. Try replacing the switches to see if that solves the problem.

If you are not comfortable working with electrical systems, then it is best to take your car to a qualified mechanic for diagnosis and repair.