1982 50hp Mercury w/Thunderbolt Ign.

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FredJames8

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Joined
Nov 12, 2009
Messages
1
This is a 4 cyl engine that starts but has a miss. I noticed that the two bottom cylinder arent firing. I pulled the spark plugs and turned the engine over to check the spark and the bottom two plugs wouldnt fire. I pulled the plug wires from each individual coil and ohmed them from the output to each input and they were nearly the same as the ones that were firing. I would suppose that switch box would be the next in line to check. My question is, is there a way to test the switch box?

Freddie
 
daveswaves

daveswaves

Ensign
Joined
Mar 22, 2002
Messages
901
Re: 1982 50hp Mercury w/Thunderbolt Ign.

FredJames8 said:
This is a 4 cyl engine that starts but has a miss. I noticed that the two bottom cylinder arent firing. I pulled the spark plugs and turned the engine over to check the spark and the bottom two plugs wouldnt fire. I pulled the plug wires from each individual coil and ohmed them from the output to each input and they were nearly the same as the ones that were firing. I would suppose that switch box would be the next in line to check. My question is, is there a way to test the switch box?

Freddie
Click to expand...

http://www.cdielectronics.com/downloads/CDI_TS_Guide.pdf

Good troubleshooting guide for the CDI switch boxes, yours may be a CDI or mercury but the terminals are the same and the test is the same.
 
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