How do you check voltage drop on a coil?
You can do that by putting the voltmeter between the coils out going LT terminal and earth while cranking the engine which should show a voltage change as the coil is switched. Put the voltmeter on it’s highest DC range for this test. When I do this I get a DROP from about 13 to 11 volts.
What is the primary voltage of a coil?
At the predetermined point of ignition, the coil’s earth is removed and the magnetic field collapses. As the field inside the coil’s 250 to 350 primary windings collapses, it induces a voltage of 150 to 350 volts.
What should resistance be on motorcycle ignition coil?
Sometimes the cap itself can add extra resistance to the results. The result of the resistance should be very low. It should be 0.5 to 1.5 ohms. The resistance can be measured from the ground terminal wire or the primary wire. The primary wire is the one that is going towards the CDI points or CDI box.
How to isolate a bad coil high voltage wire?
To isolate the fault, turn the ignition key on without attempting to start the engine and then remove the distributor cap. Ensure that the points are open and adjust a multimeter to the volts setting. Touch one probe to the insulated side of the points and the other to the engine block.
What should the resistance be on a Delco ignition coil?
This reading of 8.84 does indicate that the coil’s secondary windings are not putting out as much voltage as they should; the minimum acceptable resistance reading here should be 11.00, with approximately 13.5 being normal. Here’s the primary reading on the new replacement GM Delco coil before I installed it.
What should the voltage be on a motorcycle ignition coil?
Most motorcycle ignition coils use a pulsing 12 (or in some cases 14.5 volts if the battery is good) to spark the plugs. Your bike might have a magneto, but all best are off if you find ignition points. its a 6v system and yes, it has breaker points.
How to get 12 volts to the coil?
Connect a 12 gauge marine wire from the “I” post on relay to the + post on the coil. That will deliver a full 12 volts to the coil while cranking. If you give Kurt a chance he is likely to post up a photo of the relay. You really only need to do this if you have the points type distributor with the resistor.
How many volts does a 3 foot DC coil lose?
Using a voltage drop calculator, 10 amps @ 12 V dc, 20 foot #10 wire = 6.7% voltage drop = 11.2 volts at the coil; versus a 3 foot run loses 1% = 11.9 volts at the coil.
To isolate the fault, turn the ignition key on without attempting to start the engine and then remove the distributor cap. Ensure that the points are open and adjust a multimeter to the volts setting. Touch one probe to the insulated side of the points and the other to the engine block.