Not charging

Trevorbm

“Only full sends, we’ll fix it later”
Location
Xenia Ohio
I want a second opinion on this. My lightning coil is reading 1.6-1.9 ohms resistance and when cranking I’m getting 3-4 volts ac. Guessing she’s toast?
 

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
That coil is toast , obviously if you want to charge 12v battery and you are using AC voltage , you will lose half the voltage when you run it through the rectifier, at any rate it should be around 100VAC unloaded at 7000 RPM'S .
 

Trevorbm

“Only full sends, we’ll fix it later”
Location
Xenia Ohio
That coil is toast , obviously if you want to charge 12v battery and you are using AC voltage , you will lose half the voltage when you run it through the rectifier, at any rate it should be around 100VAC unloaded at 7000 RPM'S .
Figured, ordered.
 
What is the output of the coil unloaded when running ( That means not connected to the voltage regulator )
Timely post. Is this likely to change the voltage? I got stupid and swapped stators and it gave the same output. Starting to think my voltage reg is the problem bc I never unplugged it (my stators are on plugs).
 

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
When I say to check it unloaded , it has to be disconnected from the regulator , otherwise you are checking through the regulator rectifier, to check individual components they have to be isolated out of the circuit .

Usually that means going inside the electrical box and disconnecting the stator wires from the voltage regulator -rectifier , then check the voltage in between the two wires with the ski running , more checking parts equals less changing parts.
 
Last edited:
When I say to check it unloaded , it has to be disconnected from the regulator , otherwise you are checking through the regulator rectifier, to check individual components they have to be isolated out of the circuit .

Usually that means going inside the electrical box and disconnecting the stator wires from the voltage regulator -rectifier , then check the voltage in between the two wires with the ski running , more checking parts equals less changing parts.
Yeah, I got lazy. I had the box open I just didn't check with the voltage reg unplugged. I've had such terrible luck with stators in the past I just went straight to changing it.
 

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
I get it I hate pulling Yamaha electrical boxes apart too , but sometimes you just have to buckle down and do it.
 
Okay new stator, new regulator in. With regulator unhooked, I get a solid 20v+ at idle. With regulator hooked up, 3-4v. Voltage across battery steady at around 13.3v, which is the charge before I put it in.
 
Top Bottom