problem with charging ciurcut

[4fish]

I have a 1986 90 hp yamaha ELTH. My problem is the motor will run without a battery. With the battery connected no charge is going to the battery.Any Ideas
I also would like a schematics for the charging ciurcut
any help appreciated

 

[sigma]

Re: problem with charging ciurcut

Sounds like you are foing to need a new stator or have a good elec shop rebuild it. One side is out and it is running the spark plugs off the charge side leaving nothing left for the battery.

 

[stylesabu]

Re: problem with charging ciurcut

check your fuses. I had same problem with my newly aquired suzuki 75. it could also be recfifier. fuses are under engine cover. do you have a tach/does it work? these engine only put out low amp 6-9 at best. so voltage reading is critical, anything over 12.6 is good when running.12.6 is charged battery voltage

 

[4fish]

Re: problem with charging ciurcut

It looks like some one has replaced the stator earlier because the wire colors don't match the rectifyer cover I need a schematic and the values that i should find at the terminals

 

[rodbolt]

Re: problem with charging ciurcut

that 90 will run with no battery as its an altenator driven CDI ign system.
however by dissconecting the battery you can fry the regulator/rectifier.
check stator lighting coil output voltage and then regulator output.
lighting coils and ign charge coils are seperate and isolated.
be careful what advice you read.