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Bad Ballast Resistor

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The ballast resistor is commonly found in older vehicles because they did not have the. The ballast resistor is about 5 10 ohms iirc but if it fails there will be no conductivity.

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But to find out if your ballast resistor goes bad the car will only run while trying to start.

Bad ballast resistor. The ballast resistor is commonly found in older vehicles because they did not have the benefit of circuit boards found in most of todays vehicles. What i came up with was i had full power to the top of my ballast resistor and only about half power if that to the bottomthe wire that connects to the bottom one goes to my distributor. Through clever wiring the power to the coils is always routed through the ballast resistor unless the starter is spinning in which case the ballast is by passed.

Yeah ive found that a bad coil or wrong wiring like attaching the tach to the coil on a msd system going to the coil will cause the ballast resistor to get really hot. This is a classic sign of a bad open or broken wire ballast resistor. Oct 19 2013 1.

I grabbed my test light and checked everything. Over time the ballast resistor can be damaged by normal wear and tear so there are a few things to look for when you suspect a bad or failing ballast resistor needs servicing. The reason that it starts in the start position is that some years have a bypass wire from the starter to the coil that is hot in the start position.

A ballast resistor is a device in your vehicle that limits the amount of current in an electric circuit. The resistance value of the ballast resistor is calibrated to deliver the 7v or so expected by the coils at idle. This is where the ballast resistor enters the picture.

Is that the resistor working or.

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