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Old 03-02-2026, 09:25 AM   #4
glennpm
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Join Date: Sep 2014
Location: Mid-Coast Maine
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Default Re: testing for the existence of ballast resistor in my car

All you have to do is move either the red-black wire or the red wire connected to the resistor so both wires are attached to the same resistor post.





If you wish to check the resistance, disconnect the red wire from the coil. Now check the resistance from the ignition switch to the red wire end you disconnected, noting that the resistance will rise as it heats up.
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