Bad coil on 84 Merc 50 4 cyl

yoba439

Cadet
Joined
May 31, 2006
Messages
10
Hello all,I have a question about the four coils.I have installed a new switch box,stator,trigger rebuilt both carbs,new plugs,compression is about 110 on all cyl. and fuel pumps on this motor.I still have a slight miss at idle.The manual says the coils should test .2 ohms on primary and 800-1100 ohms on sec/output.I noticed all the coils are blue in color except for the #2 which is black and has a crome ground strap.This is the coil that is only testing 562 ohms and the others is 955 or close which by the book is in range.I am trying to figure out if the one black one was already changed out or if it was the only original one and the blue ones are newer.I already ordered a new coil.I am trying to make sense of this as to if the specs on the black aftermarket coil is normal or not.Any ideas.I also ohmed out the plug wires at .2 to .6 ohms.<br />PS Please don't move this to the coil post because I could not find it:)<br />Thanks
 

Laddies

Banned
Joined
Sep 10, 2004
Messages
12,218
Re: Bad coil on 84 Merc 50 4 cyl

Most aftermarket coils use the same specs. as the OEM product
 
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