Unsure how to tell if your Classic British Car has a ballast resistor or not? The Moss Motors Tech department has put together this video tip to show you how to test your car in less than a minute.
After doing my own test on to old coils.One with a Ballast Resister in it and one without I found 10.4V on the 1.5 Ohms coil and 11.7 V on the 3 Ohms coil.Then put in a Ballast Resister & I got 6.1 V on the 1.5 Ohms coil & 8.4 Volts on the 3 Ohms coil. The battery was 12.6Volts
Yes, but, if the points happen to be open during this test it will show approx 12v whether or not it has a ballast resistor. Make sure the points are closed or jump the negative wire to ground while measuring the voltage.
After doing my own test on to old coils.One with a Ballast Resister in it and one without I found 10.4V on the 1.5 Ohms coil and 11.7 V on the 3 Ohms coil.Then put in a Ballast Resister & I got 6.1 V on the 1.5 Ohms coil & 8.4 Volts on the 3 Ohms coil. The battery was 12.6Volts
lomasck 3 months ago
but what if the coil has a ballast resistor in it.
lomasck 3 months ago
very useful information.thanks
mstrgns 1 year ago
Yes, but, if the points happen to be open during this test it will show approx 12v whether or not it has a ballast resistor. Make sure the points are closed or jump the negative wire to ground while measuring the voltage.
DEW409 2 years ago
so simple even I get it :)
xfire7 2 years ago