I have a motor i was told was a 73 evinrude 60 hp the model no is 60173c sn# j13222 I have a book for the 73-91 engines but it only shows a 89 60 hp by evinrude. It is a 3cyl 3 carb one coil with the amplifier box next to the coil. it doesn't seem to be getting any spark so I need to know if this is a 73 model so I will know hot to fix. Any sugesstions wolud be helpful. I did check to points and they are set correctly and working. I do have 12vdc going to the amp box and 11 vdc out of the box to the coil. When I mesured the resistance btween the two coil wires I get zero ohms, Does this indicate a bad coil as I am led to belive and is there a way the verifie this. 