Charging problem

[dyzio]

Triumphs

A few days ago the bike (Daytona 675) failed to start (no juice in the battery). I've recharged the battery and tested the following:

1) unplugged battery: 12.9V (battery was charged and bike started a few times yesterday.
2) battery on bike, ignition off: 12.6V
3) ignition on: 12.2V
4) bike running @idle: 12.25V
5) bike running @5k: 12.6V
6) 3 phase AC @idle (RR unplugged): 21V, 20V, 17V
7) 3 phase AC @5k (RR unplugged): 45V, 60V, 48V
3 phase resistance (bike off): 0.3 ohm
9) 3 phase resistance to ground: 0.3 ohm
10) leakage current: 1.3mA (bike has no alarm)

Looks like the RR is at fault as it's getting the 3 phase voltage and not converting it.

However, I am baffled by:
9) 3 phase resistance to ground: 0.3 ohm
6) 3 phase AC @idle (RR unplugged): 21V, 20V, 17V
7) 3 phase AC @5k (RR unplugged): 45V, 60V, 48V
Why despite what looks like a short cct to ground am I getting roughly the correct voltages?

Also the diode test on the RR didn't show an obvious fault.

Any ideas what's at fault?

Cheers

[Biker Biggles]

When I did that on a curvy sv the ac voltages were all higher than that,something like 60+ volts,all three of them.Are you sure those values are correct?

[dyzio]

Can't be sure, the service manual doesn't state what the 3 phase voltage should be :/
They did go up when rev'd above 5k.

[DarrenSV650S]

Charging voltage should be at least 13V shouldn't it?

[dyzio]

Darren, yes it should, 13.5-15V.

The service manual says the AC voltages should be above 10V at idle and above 30V at 5k rpm.

Another possibility is that I have 2 things that are fekked. Stator (short to gnd) and the RR.
But why would the stator be putting out the correct voltages then?

[dyzio]

The bike has had the RR recall done, but it's not unheard of for the 675 to burn the RR more than once.

I've checked the connectors and they looked ok.

[dyzio]

Originally Posted by Seeker

When you short your meter's probes together, are you getting 0.3Ω or 0Ω?
0.1

You said that you measured 0.3Ω on the stator phases. Did you measure across each phase (1-2,1-3,2-3)?
Correct

It would be unusual for them to all have identical impedance. If you were getting 0.3Ω with your meter's probes touched together and then 0.3Ω across any of the stator's phases you were, in fact, reading 0Ω, indicating a short within that phase. The spec for the Triumph stator is 0.4-0.6Ω on each phase.

When you measure the AC phase voltages, are you measuring 1-2, 1-3, 2-3 with the R/R disconnected?
Correct
Likewise, when you measure the impedance of a phase to ground, do you have the R/R disconnected?
Correct, plugs don't allow access for measuring, so the need to be removed.

The R/R must be disconnected to get sensible readings (especially for impedance measurement).

Thanks

[dyzio]

Looks like you wouldn't.

I've received the replacement part today and there is no short between the phase wires and the metal centre of the stator, so there should be no short to ground once I fit it.

I've managed to source both RR and stator.
I wonder if my old RR is ok, or more, once I replace the stator and run it with the old RR is there a significant risk of damaging the new stator (only run long enough to do voltage tests)

[dyzio]

No, there's been a bit of a misunderstanding (bought off a forum) and it's from a 2010 or 2011 bike.
Says SH820AC.

It looks like the FH012 is what I had fitted by Triumph.

[dyzio]

I wonder if there is a check I could do on the old RR.

I did the diode test on it and got consistent results (same levels of continuity in one way and an OL in the other on both terminals).

Would this confirm 100%?