good reading: http://www.yuasabatteries.com/pdfs/TechMan.pdf

The DS uses sealed lead acid batteries. Full charge for these types of batteries is between 12.8V and 13.0V

 

Well I wanted to give a little update finally.

I unhooked the negative battery cable, tested from the cable to the positive on the battery, and I have .03 volts, so looks like i have a small draw when the machine is off, a short somewhere.

I check the resistance for the temp switch and i have infinite resistance, so I am assuming that its ok

I charged the battery yesterday, and had like 12.9 volts across the terminals, i start the motor and still have 12.9, rev the motor and the voltage starts to drop, 12.8, 12.7, etc.

Can I check the output voltage of the regulator? If so whats the best way to do this?

Thanks again guys for all your help

Andy

 

sounds like either the wiring somewhere from the generator output connector to the input of the rectifier or the wiring from the rectifier output to the battery, or maybe a bad rectifier.

rusted or loose connectors/pins, broken/damaged wire.

you could ohm out the wiring harness at the connectors that the rectifier plugs into. each of the three generator wires should ohm out zero ohms back to the connector at the stator. the 12V wire should ohm out to zero ohms back to battery +12V terminal. the ground wire should ohm out to zero ohms back to battery ground terminal.

 

I checked some more things on the 650 today.

First I checked the resistance from the generator wires between the rectifier and the magneto plug, and I get .6 ohms on all three, I then checked the voltage back there, and got 25 Vac, just as I did right out of the magneto.

The ground wire reads 0 ohms, and the 12v+ wire reads .6 ohms.

Also I checked the voltage between the ground and the 12v+ right out of the rectifier and I get almost nothing .02-.03 Vdc

Shouldn't I have like 14.5 coming from the rectifier?

I hope I'm not being a pain, I'm just trying to sort all of this out

Thanks

Andy

 

it's almost certainly the rectifier itself then. they are around $100 from the dealer. i don't recommend testing the new rectifier without a load connected to it's output. just hook the new rectifier up and measure across battery - you'll know if it's working.

 

I agree, sounds like the rectifier is the problem.

 

did the new rectifier work?

 

I put the rectifier in Tuesday, I have 14.16 v across the battery now

I rode all day Saturday without a problem

Thanks guys for all your help

Andy

 

Well hello again all.

Jumped on the 650 Thursday, rode for about an hour, let it set for 1/2 hour went to start it to put it away, dead battery.

put the charger on it, charged it for couple hours, checked the voltage across the battery 11.5V

wiggled the wires, 13.9v

found that i could see a spark under the insulation of the 12V+ wire coming out of the rectifer.

took it to the dealer, they replaced it for free, what a shocker!!

hooked it up, have 14.2 volts, let run for about 5 min, rode for 10 min, came back rectifier is almost too hot to touch, and im down to 13.5-13.6 volts

Question is how hot are these things supposed to get, or do I have something burnin up my rectifier?

Thanks

Andy

 

you could try DSDuneCrazy's test for something drawing down the 12V line - see his post above.

you could also borrow an inductive ammeter to measure the current draw from the rectifier and the battery. I think 20 amps was the max you could draw from the rectifier.