I think I have made and expensive mistake. My tacho stopped working and in searching previous posts learned that:<br /><br />1. The tacho signal is derived from the voltage regulator<br />2. The VR can blow when the battery is disconnected.<br />3. Some battery switches disconnect when switching from one battery to another.<br /><br />I left the auxilliary battery on to work the automatic bilge. I started the motor on the main battery and then switched over to both batteries to charge the auxillary. Has this blown my VR?<br /><br />If so this is an expensive lesson.
