Topic: cb550 stator: screwed?

[nilsey]

i'm reading about 1 ohm across the terminals in all three combinations, when i perform the stator test at the rectifier input (across the yellow wires).

is the stator screwed? i've read conflicting info in that the spec for the 76cb550 is 0.35 ohms but some on this forums have said values of around 1 ohm are OK.

[TwoTired]

Very low resistances take a careful technique to measure accurately.

The meter must be capable of measuring these low resistances. And you have to subtract out the probe and wire resistance.

Very rare that stators go bad without some sort physical damage to the cover.  Your 1 ohm reading is likely ok.  You should also make sure that none of the yellow wires is shorted to the engine case.  Then declare it good.

Cheers,

[scottly]

Trust me, what ever meter you have is not capable of accurately measuring .35 ohms. If all 3 combinations across the yellow wires are the same, and there is no continuity to ground from any of them, chances are the stator is OK.

Edit: TT beat me to it!

[nilsey]

Well we were reading 28-32 VAC at 4000rpm  -- shouldn't we be expecting around 40 VAC @3000 rpm?

[bryanj]

Only if the field coil is getting full battery voltage

[TwoTired]

Well we were reading 28-32 VAC at 4000rpm  -- shouldn't we be expecting around 40 VAC @3000 rpm?

How are you measuring it?  Need probe points.

[nilsey]

we were measuring at the connector between the stator and the loom (still connected, otherwise the field effect coil would not be active), between the three yellow wires (each coil set).

Whats the correct test procedure for this?

i want to believe my stator is fine, i really do! how can i make sure?

[TwoTired]

we were measuring at the connector between the stator and the loom (still connected, otherwise the field effect coil would not be active), between the three yellow wires (each coil set).

Whats the correct test procedure for this?

 I like to see what is being applied for rectification.  This means using an AC meter setting and probing between the Green rectifier wire and each of the yellows or the Red rectifier wire and each of the yellows.
Each diode loses about .7 v during conversion.  So, to make power flow to the battery, the ac volts must be about 16-17 volts AC or higher.
Higher voltages improve the recharge rate of the battery, assuming all six of the rectifier diodes are operating.
The alternator generally makes higher voltages when it spins faster (to a point).
A working stator output voltage is also dependent on the DC voltage applied to the alternator field coil, and the integrity of that coil.

Cheers,