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Discussion Starter · #1 ·
Left for cruise night the other day and engine just died. Friend thought it might be the coil so we replaced it, same problem, it cranks just fine, but no spark. Tried new point and condensor, still same problem. What might it be and how do I check it. This is on a stock 1972 -350 sb.
 

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Check you have power to the + side of the coil with ignition on and cranking, check black wire from points to the - side of the coil for breaks or shorts, check rotor is making contact with cap and the inside of the cap is clean and dry, pull off a lead, stick a plastic handled screwdriver in the plug end, hold it about a 1/4 inch from valve cover or bare metal while a buddy cranks it over and see if you get a spark there.
 

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How many volts? Should be ~9 ish key on, full battery voltage when cranking. If you have no volts Key On, and battery voltage on crank, check your ballast resistor/ wire and the IGN fuse in the fuse box
You're only getting a 12v supply when cranking from the yellow (resistor bypass) wire from the starter.
The resistor wire is a white (or was) cloth insulated wire to the + side of the coil.
 

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Discussion Starter · #8 ·
Thanks for all the help. Finally started after replacing a second set of points and condensor along witht the wire that runs from the negative side of the coil to the points. What a relief!
 
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