Thread: Alternator...help!!

An old trick many years back was to pour clean rain water in the alternator while its running to wach all the grit out and hopefully it will start to work..
the mud sticks the brushes and then they dont charge....

Originally Posted by sclarke

An old trick many years back was to pour clean rain water in the alternator while its running to wach all the grit out and hopefully it will start to work..
the mud sticks the brushes and then they dont charge....

Good idea, thanks. Gave it a try but no joy though.

If the alternator is putting out 12.1V, once the battery drops to that level the light should go out yes?

invariably if its a disco whats happened is some crap has gotten into the bushes for the slip rings and some more has come under lifting the bushes....

the crap in the bushes is holding them off of the slip ring so you are getting nothing out of the alternator...

with just parklights your battery, if standard, will drive a D1 for 70 minutesish before it gets too low to drive the fuel pump.

its a DIy to sort it out but I reccomend going to new brushes as the old ones will now be worn and will damage the slip rings if you try to reuse them...

dont ask how I know.

Originally Posted by Blknight.aus

invariably if its a disco whats happened is some crap has gotten into the bushes for the slip rings and some more has come under lifting the bushes....

the crap in the bushes is holding them off of the slip ring so you are getting nothing out of the alternator...

with just parklights your battery, if standard, will drive a D1 for 70 minutesish before it gets too low to drive the fuel pump.

its a DIy to sort it out but I reccomend going to new brushes as the old ones will now be worn and will damage the slip rings if you try to reuse them...

dont ask how I know.

Thanks Dave,

it's a Defender Td5 so similar I guess. Pain is that I don't really have time to stuff about doing it myself. (And, as is usual with a newer vehicle it looks like you just about have to take the engine out to get at the thing).

Went for a run yesterday and foolishly drove through some deep muddy water. Now my charge light is on. Didn't come on yesterday, only this morning.

Alternator is putting out 12.14V with the motor running, seems a little low, the battery reads 12.4V with the motor stopped

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Your alternator is not putting out anything. That is just battery voltage at teh alternator terminal. They are connected by a BIG wire.
Regard sPhilip A

Originally Posted by PhilipA

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Your alternator is not putting out anything. That is just battery voltage at teh alternator terminal. They are connected by a BIG wire.
Regard sPhilip A

Hmmm, yes, good point.

Originally Posted by Frenchie

Thanks Dave,

it's a Defender Td5 so similar I guess. Pain is that I don't really have time to stuff about doing it myself. (And, as is usual with a newer vehicle it looks like you just about have to take the engine out to get at the thing).

nahh you get it out from the bottom, search out my provent thread.....
this one.

Hi Tony
Millsbritish has one on Ebay(He is in Kalamunda)
12.1V dead as by the sound of it.
GOODLUCK
Andrew