Mercury 850 1970-1976's Model Charge problem

[Xeno]

hello new to this forum and a novice when it come to boat motors , got a 850 mercury 1970s to mid 1976 model that isn't charging . do these motors have alternators ?? or do the starter charge. I see that my starter has a gear that looks to fit around the flywheel. I also forgot to mention that it does run but seems to kill my batteries? Any help would be great as i am trying to save money like most are these hard times.


Thanks.

 

[merc850]

Re: Mercury 850 1970-1976's Model Charge problem

You're gonna need a wiring diagram here it is.
The stator is under the flywheel, check the wires that lead to the rectifier for bad insulation and breaks. Disconnect the wires from the rectifier and check with an ohmmeter should be around .25 to .35 Ohms.
Here's how you test the rectifier.
Also check the red lead from rec. to Positive battery.

 

[Xeno]

Re: Mercury 850 1970-1976's Model Charge problem

thank you very much for your help .

 

[Xeno]

Re: Mercury 850 1970-1976's Model Charge problem

View attachment 116245View attachment 116246View attachment 116247View attachment 116247View attachment 116248



ok i hope the pictures are visible now

 

[Xeno]

Re: Mercury 850 1970-1976's Model Charge problem

where exactly on this picture of my motor would i find the rectifier ?

 

[merc850]

Re: Mercury 850 1970-1976's Model Charge problem

Can't see the attachments, try putting them inline with the message.
Follow the two yellow wires from the stator (under flywheel).

 

[Xeno]

Re: Mercury 850 1970-1976's Model Charge problem

tried to inline the pictures should now be visible

 

[Xeno]

Re: Mercury 850 1970-1976's Model Charge problem

I tried using the multi meter on battery while running the motor . i saw volts go from 12 to 12.5 to 13 and 14 volt. would this indicate that the battery is being charged ?

 

[Faztbullet]

Re: Mercury 850 1970-1976's Model Charge problem

Yep...