No spark on two cylinders

[GPierce]

Originally Posted by BRENT in 10-uh-C

Geez, ....

I have seen this trouble shooting method too many times.

[Big hammer]

Originally Posted by BVZ24

12v at ignition switch, 12v at ammeter, 12v at both terminals of the J-box. 12v at one side of the resistor and 6v on the other. Resistor is hot to the touch. 6v at the resistor side of the coil. Points open. 6v between coil terminals. 50mV frame to ignition side of coil. 50mv condenser side of points. 16mv other side of points to frame.

Put the fancy dancy auto ranging vom back in your toolbox, go buy a 5 $ analog meter to use on your A.

[BVZ24]

Something in the range of 15 mv is near 0. It can be from small differences in temperature or alloy. When it switches from 15mv to 50mv I think fault or heat.

[BVZ24]

Solved.
The loss of two cylinders was a result of a worn out lower body. I assembled 3 distributor bodies on the bench and only one of them would spin in the center of the points. I thought it was funny that my good one was the one that cosmetically looked the worst.

The 2nd issue of no spark turned out to be a short in the top plate due to the insulator on the spring screw being under moulded and only covered half of the terminal. Replaced insulator with the insulator off of my old points.

[GPierce]

Solution was in post #2.

[Gary WA]

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Originally Posted by BRENT in 10-uh-C

Sounds to me like the upper distributor plate is worn, -and/or the distributor housing is worn at the upper area where it pilots the upper plate. When that happens, the distributor points cam does not provide equal lift to all four spark plugs due to the plate being offset.

You won the dart game

[Patrick L.]

Thanks for posting the problem.