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Lightspeed Plasma III Wiring
Does anyone out there happen to have a Plasma III for six cylinder laying about where you can help me trace the wires from the hall effect PC board to the 15 pin input connector?
As I mentioned before, the 15 pin input connector on my Plasma III had to be cut off to remove the engine (firewall hole was too small and I did not want to unbolt the prop to hang the timing sensors loose) so now I have to field install the 15 pin connector. The installation manual is well written however it does not state the colors of the 9 wires that run from the crank sensor PC board to the 15 pin connector. If I knew what colors the wires were that powers channel A / B / C then I could deduce the respective black and bare wires. Inside the single large cable are three shielded sub-cables and each sub-cable has a black wire, a bare non-insulated wire, and then the third wire is the only difference and that would be either a white or green or red wire. Can you please tell me what color wires are connected to the following pins: Channel A: PIN 3 of the HALL EFFECT sensor is a ??? wire and it connects to PIN 4 of the INPUT CONNECTOR (this is a 5 VDC power to the HALL EFFECT sensor and it shares PIN 4 with channel C) If I knew what color wire was Channel A then I could deduce the respective black and bare wires. Channel B: PIN 7 of the HALL EFFECT sensor is a ??? wire and it connects to PIN 5 of the INPUT CONNECTOR (this is a 5 VDC power to the HALL EFFECT sensor) If I knew what color wire was Channel B then I could deduce the respective black and bare wires. Channel C: PIN 4 of the HALL EFFECT sensor is a ??? wire and it also connects to PIN 4 of the INPUT CONNECTOR (this is a 5 VDC power to the HALL EFFECT sensor and it shares pin 4 with channel A) If I knew what color wire was Channel C then I could deduce the respective black and bare wires. If nobody has one of these systems opened up or accessible with the prop off then I will sadly need to remove the propeller...Grrr. Any help would be greatly appreciated!!! |
I would unplug the harness completely at both ends.
Next use a jumper to ground one wire at a time to the airframe. Go to the opposite end and check what wire has continuity to the frame. Do that for each wire and you will know the color/pinout. Even easier if you still have the connector end you cut off. I don?t think I would trust colors to be consistent in a manufactured harness. Don |
If it’s only the phase wires you are uncertain about I believe it doesn’t matter which inputs are selected because they are only channels, you can find out which outputs they correspond to and change the coax outputs.
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>I would unplug the harness completely at both ends...Next use a jumper to ...
Good thinking and I thought of that however the propeller is still on. I have a trip to do so HOPEFULLY during the next couple of weeks some kind Vans Enthusiast who just happens to have a Lightspeed Plasma III uninstalled would stumble upon my thread and provide me with the wire colors...please please ...PLEASE!!! If not I will need to remove the propeller to gain access the hall effect sensor ...as I understand it the sensor end is not a D-Sub plug it is actually a PC board with wires holes arranged and numbered like a 9 pin D-Sub. Drats...if I had only removed the propeller in the first place...Grrr |
Who not just call Klaus. He is grumpy but has been helpful anytime I have had to call him.
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Do you have the dual crank sensor circuit board? If so I just removed one to upgrade to mini sensor, maybe that would help? I can maybe take photo.
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One more try
Another way would be to guess. Pull a spark plug from each cylinder but leave it connected to the harness and ground it to the engine. They will spark one coil at a time as you pull the prop blade around, telling you whether you got it right. Make corrections and re-check.
Good luck! Don |
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I did the same thing to repair my plasma 3, here is a photo of diagram I wrote down while repairing it.
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LSE III
I have dual LSE III on my RV10. No motor right now so everything is in the open.
I am on the way to the hanger now. text me at 724-622-0939 and I will take pics of whatever you think will help. |
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