Mercury 850 wont fire

kenlynn

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Sep 6, 2008
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Mercury 850 will not fire out of the coil. What could the problem be?
 

Chris1956

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Mar 25, 2004
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29,280
Re: Mercury 850 wont fire

Ken, You will need to post the year, serial num or at least say if it has a distributor or not. There are some differences in ignition type over the years.
 

Laddies

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Sep 10, 2004
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Re: Mercury 850 wont fire

Presuming that it's a single coil engine, here's the CDI test
scan0002.jpg
 

kenlynn

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Sep 6, 2008
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Re: Mercury 850 wont fire

Chris 1956 yes it has a distributer s\n is3741831 i just bought this motor need all the help i can get thanks ken
 

kenlynn

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Sep 6, 2008
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Re: Mercury 850 wont fire

Laddies thanks for the test. went out and checked one thing i only have about 8.9 volts at red and white wire when I crank it.
Do you think that is enough. i will check the rest later thanks Ken
 
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