Charge light staying on

[bumpmuncher]

Sorry a little hard of thinking this eve
Had a little run today was almost home when I saw that the charge light was staying on untill 3000rpm this gradually increased untill it wasnt going out at all . There is continuity across the slip rings on the rotor the brushes are good. I have tried a known good regulator (It was fine last time i used it ) When i removed the reg and connected D+ and DF together the charge light stayed on.

There is continuity to earth on the 3 phases when the diode board is connected.

Has anyone got any idea what my problem is
before whats left of my brain oozes out of my ears

 

[cookie]

i'd hazard a guess it's the diode board.

 

[bumpmuncher]

replacement didode tried. No change so probably not that brain seems to be working bit better today, so with any luck I will figure it out

 

[abrasion]

sorted it yet?

 

[(RIP) Bin Ridin]

Continuity at sliprings but is there a short rather than a circuit? Mine failed open so it was easy to find the fault. there should be a certain resistance, although low.

 

[bumpmuncher]

still not sussed it there is continuity on the rotor but no resistance (is this my trouble).

This one is getting to me a bit I can usually figure any problem on the bike out in a few hours, I have had virus/cold thing for the last week and it has made me more stupid than usual

Can I test the rotor by putting 12v across it and seeing if it gos magnetic or is that likely to burn it out straight away

 

[abrasion]

Ok shot in the dark.
Had the same problem with the ribena bike, not sure what model /age yours is.
Turned out to be a fried current overload dump relay( think that is what it was called) sat under the tank with the other gubbins cost £7.50.

 

[bumpmuncher]

Think mine is a 92 it only has 3 relays under the tank so will have a further look at them I have now taken the rotor out and had a good look at it, it would appear to have 1ohm of resistance. Is that enough ??

 

[Deleted account 111026]

From my notes, a new rotor normally reads about 3 ohms when tested between the slip rings, I haven't got a new one in stock at the moment so can't test one more exactly.
If yours is reading considerably lower, it could be short circuiting.

 

[bumpmuncher]

Oh dear it would appear that 1 ohm isnt enough resistance on the rotor
replacement one has 4 ohms (as far as I can tell) and everything seems to be working as it should lets see how long the bike gos before the gremlins decide to gnaw on something else Thanks for the advise and pointers


Edit
Oh well the gremlins have moved into the right carb and decided to soak my foot in petrol

 

[toadjam]

relay

had a similar prob to abrasion's , my relay was coming loose . sorted it by wrapping a cable tie around it .