Compass Demagnetizing

Do not attach magnetic devices such as magnetic CB antennas to the vehicle roof. They can cause the compass to give false readings.

Every vehicle has its own magnetic field. This magnetic field is created by the various processes a steel roof goes through when the vehicle is built. A magnetic field can also be created if the roof is subjected to a magnet, example magnetic CB antenna, magnetic tipped screwdriver, etc. If the roof becomes magnetized use a demagnetizing Tool 6029 to demagnetize the roof.

In this demagnetizing procedure you will use the demagnetizing tool to demagnetize the roof. It is important that you follow the instructions below exactly.

1. Be sure the ignition switch is in the OFF position before you begin the demagnetizing procedure.
2. Place an 8 1/2 in. X 11 in. piece of paper lengthwise on the roof of vehicle directly above compass. The purpose of the paper is to protect the roof panel from scratches and define the area to be demagnetized.
3. Plug in the demagnetizing tool, keeping it at least two feet away from the OTIS.
4. Slowly approach the center of the roof panel at the windshield with the demagnetizing tool plugged in.
- Contact the roof panel with the tip of the tool.
- Use slow sweeping motions of 1/2 inch between sweeps.
- Move the tool about four inches either side of the centerline, and at least 11 inches back from the windshield.
5. With the demagnetizing tool still energized, slowly back away from the roof panel until the tip is at least two feet from the roof before unplugging the tool.
6. Recalibrate compass and set variance.