How does a low voltage coil start a boat?
Connecting the “I” wire (with it’s temporary boost in the start mode) to the resistor’s low side (where the coil is ALWAYS connected in run mode) is the SAME as connecting the “I” pole to the plus side of the coil and uses the coil’s wire to the resistor instead of adding a second wire to the coil’s positive pole.
When do you not need a ballast resistor?
If your engine has an electronic module in the distributor, the ballast resistor is USUALLY not installed and the voltage “boost” from the “I” terminal is not required during cranking. There are some situations where the resistor may still be used with an electronic module, such as with a very low coil resistance.
Why do I get less voltage at the coil?
Although, even without the resistor, you’ll get still more voltage at the coil since the new wire run is short compared to the wire from the ignition switch – less distance means less voltage drop.
How many volts does a 3 foot DC coil lose?
Using a voltage drop calculator, 10 amps @ 12 V dc, 20 foot #10 wire = 6.7% voltage drop = 11.2 volts at the coil; versus a 3 foot run loses 1% = 11.9 volts at the coil.
Although, even without the resistor, you’ll get still more voltage at the coil since the new wire run is short compared to the wire from the ignition switch – less distance means less voltage drop.
Connecting the “I” wire (with it’s temporary boost in the start mode) to the resistor’s low side (where the coil is ALWAYS connected in run mode) is the SAME as connecting the “I” pole to the plus side of the coil and uses the coil’s wire to the resistor instead of adding a second wire to the coil’s positive pole.
What should resistance reading be on ignition coil?
Switch the meter’s resistance range to the 20K-ohm setting and attach the negative (black) meter lead to the center terminal of the coil. The reading here should be 11.00 or better, with 13.49 being about normal.
Using a voltage drop calculator, 10 amps @ 12 V dc, 20 foot #10 wire = 6.7% voltage drop = 11.2 volts at the coil; versus a 3 foot run loses 1% = 11.9 volts at the coil.