Charging problem

Thank you all, Ran, Roger, Tyler and David for the information and video. It will definetly help solve the problem. I will let you know what I find wrong with the charging system.

Best wishes,

Johann G.

Iceland.

My guess is a failed diode. Diode bridge rectifiers are old-school for sure, suck power and get hot. You can't imagine my "delight" in discovering that the 250W single phase alternator and crappy rectifier which gave me so much trouble on my 1998 Ducati was adopted by Rotax. After the Duc fried its second VRR, I replaced it with a modern SCR type used by Yamaha which not only charged at a lower rpm, producing a higher charge voltage at high rpm, but hasn't yet failed, nor do I expect it to. Of course that kind of fix on many Rotax installations is forbidden. Grrr.

Jeffry Stetson wrote:

My guess is a failed diode. Diode bridge rectifiers are old-school for sure, suck power and get hot. You can't imagine my "delight" in discovering that the 250W single phase alternator and crappy rectifier which gave me so much trouble on my 1998 Ducati was adopted by Rotax. After the Duc fried its second VRR, I replaced it with a modern SCR type used by Yamaha which not only charged at a lower rpm, producing a higher charge voltage at high rpm, but hasn't yet failed, nor do I expect it to. Of course that kind of fix on many Rotax installations is forbidden. Grrr.

Jeffry,

Can you provide more details about the Yamaha solution you adopted?  Many of us are flying experimental aircraft with Rotax power, so this might be an option for us.

Thanks!