sfellows
Well-Known Member
Our very old Whitlock/Mamba drive autopilot failed crossing from Newlyn to Milford Haven. Symptoms were some cracking noises from the autopilot/drive area when working (which has been happening for several months last season) and then we had "No Rudder Input" from the Simrad Autopilot Display. We have a Simrad NAC3 Controller unit.
On later investigation we can see 13V from the NAC 3 controller to the clutch input on the drive unit when we try to engage, but there doesn't appear to be any engagement in the drive unit.
To make things more confusing our boat is 24V standard so we had assumed the drive unit would be 24V, but having 13V out of the NAC3 is making us think it could be stepped down to 12V.
Earlier this year we took the drive unit to Cliff Mogridge (Whitlock Specialist) earlier this year to see if he could solve the cracking noises, but he couldn't find anything wrong, although it is a VERY old unit and spares are not available.
Any help/advice gratefully received.
On later investigation we can see 13V from the NAC 3 controller to the clutch input on the drive unit when we try to engage, but there doesn't appear to be any engagement in the drive unit.
To make things more confusing our boat is 24V standard so we had assumed the drive unit would be 24V, but having 13V out of the NAC3 is making us think it could be stepped down to 12V.
Earlier this year we took the drive unit to Cliff Mogridge (Whitlock Specialist) earlier this year to see if he could solve the cracking noises, but he couldn't find anything wrong, although it is a VERY old unit and spares are not available.
Any help/advice gratefully received.
