Re: Volts to coil
Brother Steiner (and others), I see how you arrive at your faulty conclusion; that the cotton insulated wire to the coil is a voltage limiter or reducer or regulator. But again, this wire plays no role as it relates to voltage.
And again, I=V/R. It's 'current' that's being reduced by the cotton insulated wire, not voltage, which is a constant.
If you had a voltmeter on the end of the lead to your starter (the big red wire from the battery), you should show 12v (~) with the starter disengaged (open circuit). Correct? Once you engage the starter, the volt-meter would show a reading of 8-10 volts while the starter was turning the crank. Correct? With the use of this big 1g braided copper wire from battery, there's not a lot of resistance (some) but no added resistor is built in, yet there's a significant voltage drop as the component (any electronic component) is under a load? Correct?
12v is still being supplied. Correct?
Back to the coil. The coil sees 12v between each dwell period. Obviously, if you're measuring the voltage at the coil with the engine running, your meter will show a lower reading than 12v. That will be case with or without a resistor (or resistor wire) in place. Again, test this yourself by substituting the resistor wire with a larger 14g braided jumper wire with no resistor. With the engine running (or not), you'll get the same voltage reading (with a voltmeter) without the use of the resistor wire as with.
The reason the engineers at Chevy added the jumper wire from the starter to the coil, is to provide full 'current' (no resistor) to the coil while the current-hogging starter is engaged. Otherwise the spark plugs would have inadequate spark during cranking. Voltage is the same regardless.
Also, a voltmeter is used to measure voltages in a steady state, which our ignition systems are not. Think of the points as a crude switch in an inductive system. If you instead used an oscilloscope to measure voltage, you would see 12v being supplied to the coil by the resistor wire.
Last edited by Straight-line-69; Apr 7th, 10 at 02:36 PM.