<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by wlcooley &raquo;</td></tr><tr><td class="quote">2006 175HP HPDI Yamaha ,oil will not pump up to tank on motor. I know the pump is working.The motor is not sending a signal for pump to come on.The bypass switch was never wired up also.Any Ideas. Long pull to a boat dealer!</td></tr></table>

The manual fill switch to manually activate the in boat oil tank pump to fill the on engine oil tank "should" have been wired up at the factory. This switch "should" be right next to the on engine oil tank.

However, if the oil pump is not automatically filling the on engine tank, then you most likely have an issue with the oil level sensor switch (assuming as you said you know the oil tank pump is good).

Unfortunately I don't have a schematic PDF I can send you, but the "B" position is bad in yours from what you are saying. The "C" or lowest position is what triggers the low oil alarm which you said you are getting.

If the oil in the on engine tank is low/out, then you should see a closed circuit (continuity) if you measure the ohms between the black lead and the blue/green lead in the sensor. If it show "open" or no continuity then you will need to replace the switch.

The part is a little over $100 depending on where you find it (new).