Ignition Coils

Ignition Coils

Inside an ignition coil there are 2 sets of windings. The primary winding and the secondary winding. The primary winding gets battery voltage and is grounded by the distributor when its a dwell period. When the circuit is broken into the firing period, the magnetic field collapse (back EMf) across the secondary winding. Because the winding in secondary are a ration of 1:100 the voltage at the secondary is way higher, which is then used to jump the spark at the plugs.

I did a resistance check of the primary winding by connecting a multimeter in resistance check and connected it to the outside terminals. The secondary was done according to the picture above.

Coil NO: IC013

Coil 1 primary: 0.3 ohms
Coil 1 secondary: 6.82K ohms
The leakage test have OL so it tells us that it is OK.

Coil didn't have any numbers on it.
Coil 2 primary: 4.3 ohms
Coil 2 secondary:6,43K ohms
The leakage test have OL so it tells us that it is OK.

Could not find manufactures specifications but test look OK. Coil 1 would need a ballast resistor to work in the primary circuit as the resistance is very low.

Wasted Spark Coil pack

In this type one coil will serve 2 spark plugs. It will generate 2 parks per cycle to both the cylinders.The wasted spark system is more reliable than a single coil with a distributor and cheaper than coil-on-plug.

I could not get a resistance reading for the coil primary as this is an enclosed unit and is inside.

Coil ! Secondary - 8.3 ohms

Coil 2 Secondary - 8.5 ohms

I could not find manufactures specifications. Visually and from my testings it looks good.