Re: Voltage coming out of coil?
My thoughts are:
1. Stevo, field relay may be stuck closed draining the battery. Use the test light between the battery cable, any one, and battery post, and unplug the field connector, light off, bad regulator, get a Wells VR715 regulator and problem goes away. If light still on, bad alternator/diode inside.
Remove BAT wire to alternator, light off, then bad diode.
However, you stated 16 volts charging, ext reg's will do this if too high adjustment when battery is hot or at operating temp. So with 16 volts, it shows alt is good, capable of producing most any amount of voltage until it melts.
External regulated charging systems are tempermental. One needs to figure in battery electrolite temperature for amount of battery charge, regulator temperature for voltage charge. I adjust charging voltage at the battery posts, as this is the correct place to measure. I start the car, let the engine run at 1500 for 15 minutes, I adjust for 13.5 volts at idle with headlamps on. Rev engine to 3000 and voltage should not be over 14.8 volts with lights off, including all accessories off.
2. Resistive wire measurements. If the points are open during measurement, then battery/charging voltage will be read as there is no current flowing, max voltage. Close the points, a reduced voltage will be read. Over time, the heat goes up, because current is being dissipated as heat, voltage goes down. Now, as the points open and close, a pulsating DC voltage waveform is made, the DMM is measuring a rough average DC voltage. The higher the rpm's, the higher the voltage measured. So, 6-8 volts at idle up to 9-11 volts at higher rpm.
A DMM is really the wrong tool to measure ignition voltage because the display does not react quick enough to show the flucuations. The better models of DMM;'s have an analog bar across the bottom of the display reacting in real time. The proper meter to use is the ever famous analog meter, the D'Arsonval meter movement, Simpsom 260, Triplett PSM-4, etc. An analog meter has a slow frequency response.
If you're going to troubleshoot an old circuit/equipment, use the test equipment from the same time period.
As said, just my thoughts.
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