Quote:
Originally Posted by GB SISSON
So are you suggesting using a resistor on a 12v coil with an internal resistor? Does the blue bosch have an internal resistor?
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The issue here is we have no idea what coils are being used and at what rpm the voltage is being checked. What you want is somewhere in the range of 3 to 4 ohms in the circuit. If it requires a ballast resistor or not depends on the resistance in the coil (and the rest of the circuit). If the coils are overheating then there is most likely an excess of current flowing through them. This could be the wrong resistance in the coil(s) itself or excessive voltage being supplied to it. Just switching out coils is not going to tell you much unless you know what they are. A coil might work fine in one vehicle and not in another. Only way to know is how it is set up in the original vehicle and how the voltages compare between the two at higher rpms.
Heat is energy and the energy to heat it up has to come from somewhere.