Good to think of electricity flow like water. Goes from point-A to point-C along path of least resistance. Meaning if you see +12v at A and then at C, it certainly would've flowed through point-B and all wiring in between as well. So... let's test circuit for flow from beginning to end. Clamp meter's negative probe to battery's negative terminal and use positive probe to test voltage at following points.
1. battery positive terminal = ? volts
2. power out of starter-solenoid white wire =
3. power going into ignition-switch white wire =
4. key ON, power going out of ignition-switch blue wire =
5. key ON, power going out of ignition-switch red wire =
6. key ON, power going out of ignition-switch white/back wire =
7. key ON, power going out of ignition-switch brown wire =
8. key ON, power going out of ignition-switch orange/green=
9. key ON, run-switch ON, power at each ignition-coil red wire =
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