Malfunctioning autopilot

[Steve - Raymarine - Moderator]

I have enclosed the test for the fluxgate compass, this will determine if the issue is with the compass or the course computer. What is the model number of the course computer? What type of drive are you using?

Compass Test:
Multi-meter should be set to:
(a) Resistance scale
(b) 200 ohm scale
The following procedure should then be followed:
1. Disconnect the transducer from the system.
2. Connect one multi-meter lead to the red wire and the other lead to the green wire and a reading as indicated in the test data table should be present.
3. Follow the above procedure for all the color combinations indicated in the test data table.
4. If all readings match those indicated assume the compass transducer is functioning correctly.

Compass Test Data:

Red to Green - 4 ohms
Red to Yellow - 4 ohms
Green to Yellow - 8 ohms
Screen to Blue - 8 ohms
All other combinations - OPEN
You are looking for a short or open. A +or - 2 Ohm reading is allowed.
If this check indicates a fault with the compass then you will be best served by replacing the compass. If no problem is indicated then you should send the compass and the course computer to a repair facility for evaluation.