Ignition coils

Wasted Spark Coil Pack

Coil # 1 Secondary 6.96 - 0.2 = 6.76 ohm

Coil # 2 Secondary 7.02 - 0.2 = 6.92 ohms

Specifications

Ballast resistor BR3

Ballast resistor ohm specification 1.5 - 1.75 ohm

Measured Resistor values

Ballast resistor No 1 measured ohms 2 - 0.2 = 1.8 ohm                                  Not serviceable

Ballast resistor No 2 measured ohms 1.8 - 0.2 = 1.6 ohm                                Serviceable

Measuring Current Draw and Voltage Drop

Coil resistor = 1.1 ohm

Ballast resistor = 1.6 ohm

Ohms law

V= IR

Voltage drop across Ballast resistor

V = 4.06 X 1.6 = 6.5 V

Voltage drop across coil

V= 4.06 x 1.1 = 4.46 V

Current draw  4.06 A

Coil calculated voltage drop 4.46 V

Coil measured voltage drop 4.09 V

Ballast resistor calculated voltage drop 6.92 V

Ballast resistor mearured voltage drop 6.5

Q. Did your calculated values equal your measured results explain why or why not?

A. The calculated voltage drop across the coil is more than measured one. It may be because of some resistance in connecting wires and mutimeter wires. Calculated drop across the ballast resistor is not matching with the measured value. It may be because of the resistance in connecting wires or bad connections