Flashing Lane Lights
in 912iS Technical Questions
7 years ago
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by RAYMOND SPEIGHT » 7 years ago
No Rob the back up switch is off. Only start power momentary switch is deployed as the starter button depressed. I have the standard Rotax switching arrangement
By the way, I have labelled this switch as 'direct battery power' which I reckon is the best description.
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by Bill Hertzel » 7 years ago
There is always the possibility that a Generator has actually failed.
Was your engine involved in the Mandatory Service bulletin from 2 years ago requiring the replacement of the Generator Stator?
https://legacy.rotaxowner.com/si_tb_info/serviceb/sb-912i-006is.pdf
https://legacy.rotaxowner.com/si_tb_info/serviceb/sb-912i-006.pdf
The Generator Cables coming from the Engine should measure less than 0.5 ohms between the three wires at each of the Black and Grey connectors.
A resistance so low that most meters will measure it as a short between the wires.
If you measure an Open, or any number much greater than what you get when you just touch the meter leads together, you have a problem.
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.
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by RAYMOND SPEIGHT » 7 years ago
Hi Bill, here is some data which may be useful although I'm not qualified to determine!
Static engine with the 3 pin connectors off the regulators A&B uncoupled:
Using arbitrary pin numbering
Black connector A
Resistance across coils.
Poles 1 - 2 : 0.9ohm Poles 1 - 3 : 0.9ohm Poles 2 - 3 : 0.9ohm
All poles have open circuit to engine block
Grey connector B
Resistance across coils.
Poles 1 - 2 : 0.7 ohm, Poles 1 - 3 : 0.7 ohm, Poles 2 - 3 : 0.7 ohm
All poles have open circuit to engine block
Engine running with the connectors uncoupled:
ac voltage
Black connector A
@ 1800 rpm Poles 1 - 2 : 31.2volts, Poles 1 - 3 : 31.9volts, Poles 2 - 3 : 31.9volts.
@ 3000 rpm Poles 1 - 2 : 50.7volts, Poles 1 - 3 : 50.5volts, Poles 2 - 3 : 50.0volts.
Grey connector B
@ 1800 rpm Poles 1 - 2 : 29.3volts, Poles 1 - 3 : 28.6volts, Poles 2 - 3 : 28.7volts.
@ 3000 rpm Poles 1 - 2 : 45.0volts, Poles 1 - 3 : 44.6volts, Poles 2 - 3 : 45.4volts.
With connectors coupled
Looking down on the fuse box terminal posts, receiving the regulator/rectifier cables numbering from left to right 1-6, A on the left and B on the right.
Engine running circa 2000rpm
direct voltage
Between 1&3 14.3volts
Between 2&3 14.3volts
Between 4&6 14.05volts
Between 4&5 2.9 volts
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by RAYMOND SPEIGHT » 7 years ago
Apologies Bill for my incomplete response, yes the factory recall stators replacement was carried out.
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by Rob Seaton » 7 years ago
I was told you should check the K1 relay in the fusebox, as it switches between the generators.
Take the lid off and see if the left hand relay is loose (as viewed with the X1, X2, X3 connectors towards you)
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