Low Voltage Output From Stator on 1974 Evinrude 85 HP

[wbelk7777]

Everyone,

I have a 1974 Evinrude 85 HP Outboard Engine. It is not getting any fire at the plugs. We start checking at the stator. We test the stator?s output at the Power Pack (terminals 7 and 8, brown and brown and yellow wires). The output with the wires connected to the Power Pack was 3 volts AC. When we disconnected the wires from the Power Pack the voltage increased to 171 volts AC. I tested the resistance on the stator wires with them disconnected from Power Pack and it came back at 630 ohms which is within the specs of 450 ohm to 850 ohms, so it doesn?t appear that the stator is shorted. I checked the magnets on the flywheel and they all seem good. I also cleaned them, but it didn?t make a difference. Is there anything else that can be causing the low voltage output from the stator or is the stator most likely bad. Thank you for your help.

 

[F_R]

Re: Low Voltage Output From Stator on 1974 Evinrude 85 HP

Are you using a DVA meter? Anyway, to answer your question, low voltage can be caused by low cranking speed. But I doubt that is the case here.

 

[wbelk7777]

Re: Low Voltage Output From Stator on 1974 Evinrude 85 HP

Thank you for your reply. I'm not sure exactly what a DVA is. I was using a digital volt meter from harbor freight. I don't have a way to know the cranking rpms, but I did remove the spark plugs to make sure the engine was turn over as fast as possible.

 

[wbelk7777]

Re: Low Voltage Output From Stator on 1974 Evinrude 85 HP

I found this information on another forum "DVA stands for digital voltage adapter. It tells you the peak volts on a AC circuit. You don’t really need a DVA meter, you can just put a normal Multimeter on AC volts and multiply the readings by 1.41". When I multiply my 171 volts AC by 1.41, I get 241 volts AC which puts me above the 225 volts AC requirement. Does this sound right?

 

[Will Bark]

Re: Low Voltage Output From Stator on 1974 Evinrude 85 HP

"No Fire" is your emergency kill switch lanyard attached securely?

 

[wbelk7777]

Re: Low Voltage Output From Stator on 1974 Evinrude 85 HP

Thank you for your reply. As far as I can tell I don't have an emergency kill switch lanyard. Here is example of the type of control box I have http://forums.iboats.com/showthread.php?t=462932 Scroll down the post to see pictures.

 

[tx1961whaler]

Re: Low Voltage Output From Stator on 1974 Evinrude 85 HP

I found this information on another forum "DVA stands for digital voltage adapter. It tells you the peak volts on a AC circuit. You don’t really need a DVA meter, you can just put a normal Multimeter on AC volts and multiply the readings by 1.41". When I multiply my 171 volts AC by 1.41, I get 241 volts AC which puts me above the 225 volts AC requirement. Does this sound right?

No. That would work with nice, slow line voltage from your house, but a regular old Harbor Freight meter really doesn't have the bandwidth to accurately measure the short duration peaks from the stator. You'll get a reading and you may catch a peak every now and then, but the DVA adapter is the way to be sure. It is just a diode, capacitor and resistor.

 

[bone9999]

Re: Low Voltage Output From Stator on 1974 Evinrude 85 HP

Everyone,

I have a 1974 Evinrude 85 HP Outboard Engine. It is not getting any fire at the plugs. We start checking at the stator. We test the stator’s output at the Power Pack (terminals 7 and 8, brown and brown and yellow wires). The output with the wires connected to the Power Pack was 3 volts AC. When we disconnected the wires from the Power Pack the voltage increased to 171 volts AC. I tested the resistance on the stator wires with them disconnected from Power Pack and it came back at 630 ohms which is within the specs of 450 ohm to 850 ohms, so it doesn’t appear that the stator is shorted. I checked the magnets on the flywheel and they all seem good. I also cleaned them, but it didn’t make a difference. Is there anything else that can be causing the low voltage output from the stator or is the stator most likely bad. Thank you for your help.

Did you ever find a solution to this? Did you replace either the stator or pack? I am having a similar issue with a Mercury, however i am using a DVA.