Re: what does charge coil and sensor do
What motor do you have again?? A V4 I believe?
Two sensor coils (1 and 2) are used to trigger ignition at each cylinder. Sensor coil 1/3 controls ignition for cylinders 1 and 3 while sensor 2/4 controls ignition for cylinders 2 and 4.
The charge coil is the power source for the power pack and the power pack is the "load" for the charge coil. The charge coils are pretty much a lengthy piece of continuous varnish coated copper wire wrapped around an iron core. Resistance can give you a reasonable test of the coil's status. What typically happens to a charge coil (if it doesn't just open up - max resistance) is that a few turns get shorted to each other through the varnish coating. This has the effect of removing some turns. Fewer turns means less inductance hence a lower output.
So, when a charge coil measures questionably against known good specs with a known good meter, you may as well change it.
