Jamie sawyer Posted December 21, 2015 Share Posted December 21, 2015 Afternoon gents, I have bought myself an early Christmas present. The petrol engine comes with a control box for regulating the spark. There is 3 wires on it. One goes to a timing sensor on the engine which I understand. There is a power supply which I will connect through a switch to a 4.2 volt Nicad to power the spark. Its 1100 mah so should be sufficient. What's confusing me is there is a 3rd cable and I have read the instructions back to front and no mention!! Its the normal control cable with Yellow, Red and Brown 3 core cable. Just like what you get on a servo. What is the use of this cable ?? I can't see why the control box needs a signal from the RX unless I use a Y lead and connect it through the throttle connection on the RX for some reason. Can someone shed some sense on this please and thank you for the help. Jamie Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted December 21, 2015 Share Posted December 21, 2015 it's a connector for a tacho on my RcExcel units. Hobbyking sell a suitable tacho to plug in on the ground. Quote Link to comment Share on other sites More sharing options...
Jamie sawyer Posted December 21, 2015 Author Share Posted December 21, 2015 Thanks Bob so I assume I don't need to use it. That's a handy wee Tacho. Might need to get that Quote Link to comment Share on other sites More sharing options...
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