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[Marks DTM Calib]

Regulator goosed then!

When the supply volts drop you get all sorts of random lights and goings on.

[robson]

When my alternator went I did not get a warning light. A recovery man checked the voltage output  it was around 12 volts he said that's Ok. next day battery flat, I believe the output should be more like 14 volts from the alternator with engine running?

[robson]

another thing that happened prior to the complete failure was that I got a bleep coming from the radio.

[Kevin Wood]

Yep, what Terbert's measurements show is a weak output from the alternator that isn't enough to fully charge the battery, and collapses once you've got a bit of load on it. It doesn't take much output to turn off the warning light so there can be a zone between complete failure and normality where there is no warning of a problem.

[Terbs]

Thanks to all for the input. Once again OOF not only says what is wrong but gives an explanation as to why.
So....we now look to migmog's link for a regulator, if you a sure that we be the one.

[Kevin Wood]

Can't remember if that's the exact one, but I've had a couple of replacement regs from MURE and they do the job.

[YZ250]

Thanks to all for the input. Once again OOF not only says what is wrong but gives an explanation as to why.
So....we now look to migmog's link for a regulator, if you a sure that we be the one.

I got my regulator from them when RobG sent me the link. Must say they provided an excellent service, as they didn't have a Bosch one in stock when I phoned them so he contacted his supplier and got them to send it direct to me. It arrived very quick as well so I was well happy. 

[Terbs]

Just got to get the alternator off now !!!! Searched the forum, and some say easy peasy, others including the one with pictures frightens me a bit !!!

[Bigron]

Mine was dead easy to do; I just made Essex Big Al tea as required and watched him! 
Thanks again, Al

Ron.

[TheBoy]

Just got to get the alternator off now !!!! Searched the forum, and some say easy peasy, others including the one with pictures frightens me a bit !!!

Guessing its not in Brakkers?

[powerslinky]

Mine was dead easy to do; I just made Essex Big Al tea as required and watched him! 
Thanks again, Al

Ron.

He's tellin'  porkies  . .  . 

sure that Ron's Missus made the tea 

Not a too bad a job Terbs   . . . you'll be alright 

[Terbs]

Unfortunately not, TB

[YZ250]

Just got to get the alternator off now !!!! Searched the forum, and some say easy peasy, others including the one with pictures frightens me a bit !!!

It's fair to say they could have put it somewhere more convenient but it's fiddly rather than hard as you are running blind when holding the nuts with a spanner.
I put mine on ramps as although it has to come out upwards it was a better height to work on for my poor old back bones. You can also nip underneath to unplug the multi-plug.
Piece of cake to do the regulator once it's off though.   

[Terbs]

Cheers, Al

[Marks DTM Calib]

Forty to fifty minutes, about 1.5 hours if its your first go

The trick is to use a ring spanner on the harder to get at fixing on the top rear bracket and to tap the sliding sleeves back into the alternator brackets prior to re-fit.

In the case of the reg change, you don't even need to actually remove the wiring as it can be swapped easily enough with it still close to the engine (but your choice)