Quote:
Originally Posted by 31scout
Just last night I was reading thru a motorcycle elec. repair manual and it said to check secondary resistance and gave a range with the high end 12,000 ohms. I checked the secondary resistance tonight and I had 1.8 Mohms, 2.3 Mohms and the 3rd coil was 8+ Mohms.
|
You usually can't do a direct ohms test on the Gill coils because they include a pair of diodes in series with the secondary for transient suppression.
The forward voltage drop of the diode pair is somewhere between 1.2 and 1.5 volts, but if the combination of series resistance and forward voltage drops is around the knee point of the conduction curve the measurements will be very erratic.
You can put a resistor in series with the secondary and run some voltage through the circuit and compare the voltage readings. I did it with a 5K resistor and a 9V radio battery and there was enough current to turn the diodes on.
Measuring the voltages across the resistor with the different coils will give you a good idea of the variation between them and you can calculate a pretty good approximation of the coil resistance if you feel the need.
As I remember it, I got about a 30% variation between coils and that was more than enough encouragement for me to replace them.
Jim
Linear Mode
