☑ Testing Resistance On A Ballast Resistor

If you have 9 or so it may be resistance wire. To test this ballast resistor you set your multimeter to resistance 20 ohms you then place your prongs of the multimeter onto the prongs of the ballast resistor.

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I believe single should read 18 ohms and dual should read 18 and 5 ohms.

Testing resistance on a ballast resistor. In such cases the actual delivered resistance can deviate from the design spec. You should then get a reading of around 15 ohms depending on the manufacture specifications. Mopar ballast resistor test.

If battery has 12 if 12 at coil mount resistor on firewall they get hot run wire from ign to input side check output side voltage. The coil you have says to run a resistor. Any significant deviation from these numbers would indicate that the ballast resistor is defective.

The deviation is almost always toward more rather than less desired resistance. Test voltage at wire from ignition to coil. You should be getting 9 volts to the positive side of the coil.

Do this with all of the wires to the ballast resistor disconnected. Using an electrical multi meter check the resistance between the noted terminals of the ballast resistors. It can be as high as 144 volts while charging but the voltage drops away when charging stops.

If your reading is below or close to the specifications it is able to be reused. Sometimes a ballast resistor will test correctly at 3 ohms under a static cold resistance test per above but perform incorrectly under dynamic load on the bike. A car battery is nominally a 12 volt battery.

To test your ballast resistor you need an ohm meter or multimeter set to ohms as previously suggested but you really need to remove the connectors from both sides of the resistor. Glenn perhaps you could edit the subject of your post and change it to how to test ballast resistors phil or admin could then make it a sticky.