Garrett Gee Posted February 13 Report Share Posted February 13 Looking for thoughts/opinions. Had the generator give up on me today right after takeoff. Got the airplane to my mechanics airport (earth-x battery for the win) and we are working on troubleshooting before pulling the engine. Steps so far: Disconnected AVC-1 regulator connector and checked for AC voltage with the engine running on the two yellow wires. Nothing (0 volts), not even a wiggle. Checked for power on the appropriate control wires and had battery voltage where expected. Regulator turns on the gen lamp fine. Everything is currently pointing to the stator at this point. My mechanic has done Rotax training, but it has been a little while, so we are trying everything we can to see what else could possibly be wrong. Did the resistance check on the yellow leads and got .2-.3 ohms, and also checked from each yellow wire to ground and all read "infinite' ohms. Are there any connectors on the back of the stator I am missing or can't easily see? The ignition coils and RPM all seem to be working correctly. Any thoughts, or is this stator likely shot. I thought it was unlikely/unusual for these to fail? Side note: Has anyone here put an external alternator on the Rotax in a CTLS? Does it require a cowling modification? Thanks, Garrett Gee Quote Link to comment Share on other sites More sharing options...
Madhatter Posted February 13 Report Share Posted February 13 https://pointsforpilots.blogspot.com/2012/12/testing-rotax-912914-generator-and.html Quote Link to comment Share on other sites More sharing options...
Garrett Gee Posted February 14 Author Report Share Posted February 14 1 hour ago, Madhatter said: https://pointsforpilots.blogspot.com/2012/12/testing-rotax-912914-generator-and.html Thank Madhatter. I ran across that article a couple of years ago while trying to learn more about how the system worked and that is what I based my original tests on funny enough. Based on that, I am pretty sure the stator is shot. Going to do some more digging before we pull the engine off the frame, but it looks like its dead. Might see about an external alternator, given the stator is around $1,100. I can do a whole Rotax alternator setup for (relatively speaking) not much more and I think it might actually be easier, assuming the cowling doesn't have to be modified. Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted February 14 Report Share Posted February 14 The external generator will not fit under a CT cowling and the pulley up front for the belt won't work either. Quote Link to comment Share on other sites More sharing options...
Garrett Gee Posted February 14 Author Report Share Posted February 14 13 minutes ago, Roger Lee said: The external generator will not fit under a CT cowling and the pulley up front for the belt won't work either. Good to know. That is kind of what I figured. Time to go pull the stator... Quote Link to comment Share on other sites More sharing options...
Jim Meade Posted February 14 Report Share Posted February 14 I put a 40A alternator on my 2007 CTSW several years ago. Got the parts from Leading Edge Air Foils. Pulley bolts on the hub and works fine. I had to modify the cowl. Quote Link to comment Share on other sites More sharing options...
Garrett Gee Posted February 16 Author Report Share Posted February 16 On 2/14/2024 at 6:30 PM, Jim Meade said: I put a 40A alternator on my 2007 CTSW several years ago. Got the parts from Leading Edge Air Foils. Pulley bolts on the hub and works fine. I had to modify the cowl. I really like that. Would love to get to play with some composite work, but I don’t wanna learn on my cowling. That does look really good though! Quote Link to comment Share on other sites More sharing options...
FredG Posted February 16 Report Share Posted February 16 I have no experience, but this looks interesting: https://stolcreek.com/alternator Quote Link to comment Share on other sites More sharing options...
Garrett Gee Posted February 16 Author Report Share Posted February 16 1 hour ago, FredG said: I have no experience, but this looks interesting: https://stolcreek.com/alternator Interesting! Quote Link to comment Share on other sites More sharing options...
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