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Old 05-21-2020, 09:35 PM   #15
Jeff/Illinois
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Join Date: May 2010
Posts: 2,789
Default Re: Checking an Ignition Ballast Resistor

Update on my 'no-fire- on the 59AB Flathead. 6V Pos. ground as original.

Coil has a resistor built in, 6V checks at 1.5 Ohms on the primary side. There is also an external resistor under the dash as original. Tried another coil also 1.5 Ohms no difference in starting. ( It has been wired this way for the last 2500 miles I have driven the truck!)

Changed condensor with a good one. No difference.

I am getting 6.1 V at the ignition switch, 6.1 V on both sides of switch w/ key on.

6.1V at the resistor on both ends. Power shows at the coil, and at the condensor w/ key on.

Voltage drops to 4.2 V across the coil and holds at 4.2V to the condensor.

I have to run errands Friday, will get back to the truck as soon as I can. I guess at this point it's either a bad coil wire or the points are closed up or something along that line.

Thanks for the tips I'll let you know what I find
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