Bosch ignition coil

[paulgozon]

The Bosch Red ignition coil has external resistor while the blue one has no external resistor. For the price i don't know the existing market price, but the red is much more expensive compared to the blue.

[electricx]

stealth,
if your car has electronic ignition, you do not need that resistor. the reason why ignition coils of yesteryears needed the resistor is to prolong the lifespan of the points or breaker points by reducing the current between its contacts. with this system, the ignition coil receives full battery voltage during start up for of course quicker starts, then when the engine has started and you released the ignition switch from start to run or on, the ignition coil receives a lower voltage because it is in series circuit with the resistor. if the coil has a resistor built inside, the available voltage at the output will be lower, hence the hard starting
jick

" the ignition coil receives full battery voltage during start up for of course quicker starts, then when the engine has started and you released the ignition switch from start to run or on, the ignition coil receives a lower voltage because it is in series circuit with the resistor. if the coil has a resistor built inside, the available voltage at the output will be lower, hence the hard starting "

The above statement is not correct, misleading to newbie particularly
to those who dont fully understand the IGNITION SYSTEM of a vehicle.

Little knowledge is really dangerous and transmitting wrong knowledge to readers.

[jick.cejoco]

" the ignition coil receives full battery voltage during start up for of course quicker starts, then when the engine has started and you released the ignition switch from start to run or on, the ignition coil receives a lower voltage because it is in series circuit with the resistor. if the coil has a resistor built inside, the available voltage at the output will be lower, hence the hard starting "

The above statement is not correct, misleading to newbie particularly
to those who dont fully understand the IGNITION SYSTEM of a vehicle.

Little knowledge is really dangerous and transmitting wrong knowledge to readers.

i apologize for your inability to fully comprehend the concept of the ignition system. please study the wiring diagrams of the ignition systems prior to them using the npn power transistors and the electronic ignition. peace bruddah

[reym]

Jick is right.

The original wiring for toyota point-gap includes a supply of 12 volts to the coil during startup, but once the start switch is disengaged, ignition switch provides the 12 volts to the external resistor w/c limits the voltage to the coil.

[barako ba ma]

Jick is right.

The original wiring for toyota point-gap includes a supply of 12 volts to the coil during startup, but once the start switch is disengaged, ignition switch provides the 12 volts to the external resistor w/c limits the voltage to the coil.

whatever happened to that einstein?:embarass: