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Stator in reverse? - draining battery down

M

malin

Joined Sep 2008
25 Posts | 3+
Pickering,UK
Have recently fitted new sparks stator , and new battery to my 03 FE400 . after being at Taffy's she starts on the button. Went on the ride, rode half a day - starting no problems. Stopped for 10 min and there would be nothing on the button. Had to kick start. went back home - battery completely flat. recharged it overnight - charged to 12.5v - pressed the button - heard quiet brrrum of starter - battery down to 10v.

Kick start it - lights are bright on ilde . Rev it up - lights dim down.

When running it shows about 8V at the battery, when reving up voltage drops down to about 2V.

Is that stators charging circuit working in reverse?

Cheers
 
Uhhh, yeah, something seriously wrong there - not sure if something is reversed or if there is something broken/mis-configured.
 
The sparks stator rewind usually only tends to the ingnition part of the stator.
It sounds like your voltage regulator/rectifier is shot. Consult your wiring diagram to make sure everything is hooked up properly.

I believe the 03's ran DC for lighting as well as for battery charging.
 
Ok, I checked the wiring, cleaned all connections, everything looked allright.
Indicators are taken off.Light switch does not work so low and high beam were linked to the indicator switch with blinker relay taken out and bridged. I dont see how that would make a difference but I have disconnected these wires anyway.
I have connected some old battery, started bike - on low revs voltage is 14V , higher revs - 13.6-13.8V, seems more normal. Battery is old and would not turn over the starter so I have to get a new one now and see what happens.

It was getting dark so had to stop on that, but next time I check if that other battery still causes voltage drop or if it was a wiring
 
Before you run out to buy a new battery................ Did you put a good charge on the old one?

I did have a battery that showed good voltage until the starter button was hit and there was nothing. Just trying to save you a few bucks!

Sounds like you are on your way to finding the shorted device! Good work!
 
What battery are you running malin?
I had two CTZ's that died within a few hours.
 
plumbbob said:
What battery are you running malin?
I had two CTZ's that died within a few hours.
Click to expand...

Its CTZ7S I think. MF is the brand.

DaleEO - I have tried to charge both of them with optimate 4 - none would keep the charge.
 
Had two of those from "mad4bikes" the first lasted about a dozen hours then went comletely dead, got it replaced and second one died before it got to double figures!
Got me money back bought a Varta YTZ7s, this is still going strong after 60 hours and will start the old 650 from cold.
 
malin said:
...... When running it shows about 8V at the battery, when reving up voltage drops down to about 2V.......
Click to expand...
Sounds like your battery may have gone completely open circuit inside or is disconnected from the charging circuit. Those voltages you measured sound like what you see from these shorting type voltage regulators when no load or battery is connected.
 
BundyBear said:
malin said:
...... When running it shows about 8V at the battery, when reving up voltage drops down to about 2V.......
Click to expand...
Sounds like your battery may have gone completely open circuit inside or is disconnected from the charging circuit. Those voltages you measured sound like what you see from these shorting type voltage regulators when no load or battery is connected.
Click to expand...

You are right, battery went open circuit. Without the battery I had the same voltages 8V - dropping to 2V.
New battery has solved the problem - just to fail a few weeks later again. LOL
 
Did the second battery fail the same way? Is there any obvious damage to it? Is yours a battery with concealed cell fill plugs that you can pull out as a strip? If so, can you get the plugs out to see if all the cells are dry?

I had a regulator that stopped working completely and allowed the full unregulated voltage from the stator across the battery. The straps over the top of the battery to hold it in place prevented some of the cell fill plugs from coming out. The battery overcharged and boiled so hard that the plugs blew out of most of the cells. The side of the battery blew out on one or two cells that could not vent properly!

I guess if this had happened to your bike you would expect all of the globes that run off the battery circuit to be blown. I suppose it is possible your reg has an intermittent fault where it works occasionally.
 

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