What causes an ignition coil to stay open?
Two types of ignition coils are shown in this picture as a reference. Author’s own drawing. Turn the ignition switch to On or Run. If the testlight stays off or the DMM doesn’t register any voltage, either the coil’s primary winding has an open or the circuit between the ignition switch and the coil’s battery terminal has an open.
What should the ohms be on the ignition coil?
So we obtain a multi-meter because my book on the car says you can test the ignition coil by ohming it out. (i should add we also bought a new rotor, distributor cap, and all new cords because the car needed it anyways). There is where i get lost… The book says it should be between 1.13-1.38ohms primary resistance.
What to do if there is no spark at the coil?
Test for voltage from the ignition switch at the positive side of the coil. Refer to the above image. If there’s no voltage, check the wire between the ignition switch and the coil and, if necessary, the switch itself. If there’s voltage, the problem may be with the pickup unit.
What should the voltage be on the pulser coil?
for the pulser coil check the voltage out put on the red to white/red wire. it needs to be at 0.5 to 1 volt DC while cranking the motor over. the exciter coil is tested on the blue to green wire the output on it needs to be about 3 to 5 volts dc while cranking the motor over.
How can I troubleshoot my ignition coils?
Remove the nut from the negative post with a 5/16-inch box-end wrench. Lift the cable from your battery, move it outside of the battery box and close the lid of the battery box. On most carbureted models (except those with breaker point ignitions) it is best to remove the spark plug leads before checking the ignition coils.
So we obtain a multi-meter because my book on the car says you can test the ignition coil by ohming it out. (i should add we also bought a new rotor, distributor cap, and all new cords because the car needed it anyways). There is where i get lost… The book says it should be between 1.13-1.38ohms primary resistance.
What should resistance be on Johnson ignition coils?
Note the multimeter’s reading. If there is a second spark plug tower for coils that fire two spark plugs, move both meter leads to the primary and secondary tower pair for the other spark plug. Resistance should be between 225 ohms and 325 ohms for all motors except for 25-horsepower and 35-horsepower two-stroke motors built between 1995 and 1999.
for the pulser coil check the voltage out put on the red to white/red wire. it needs to be at 0.5 to 1 volt DC while cranking the motor over. the exciter coil is tested on the blue to green wire the output on it needs to be about 3 to 5 volts dc while cranking the motor over.