Join Date: Mar 2016
Location: Lake Mary, Florida
Points ignition for 1967
In a previous post, I mentioned I was removing the HEI distributor and installing a period correct OEM points distributor and coil.
Got it all installed, and prior to firing the engine, I used my volt/ohm meter to check everything up wiring wise at the coil. Here is what I found:
1) Ignition key off. No voltage at "+" of coil. This would be correct. No voltage at "-" of coil. This too assumed correct, as this is the ground to coil to make it charge/discharge.
2) Ignition key on (not cranking engine). 9 volts at "+" terminal at coil. This assumed to be correct, as it is getting voltage from the resistance wire from ignition switch. I see a ground at the "-" of coil terminal when meter is on ohms.
3) While cranking. voltage to the "+" terminal of coil jumps to 11.6 volts. Assumed normal, as the second wire at the "+" terminal of coil comes from the starter (post "S" I think), as coil gets 12 volts while cranking to aid it quick start (hotter spark). I see a ground at the "-" of coil terminal when meter is on ohms.
Here's what I'm questioning. On the "-" of the coil terminal, I see Open, then close (using Ohm setting of volt/ohm meter) when I open and close the points, and with both leads disconnected at the "+" side of the coil terminal. This is assumed normal in order to cause the coil to charge up and discharge (provides a ground, and open to the coil). However, when I connect the two leads to the "+" terminal of the coil, the "-" lead of the coil shows ground always, no matter if I open/close the points. So it seems I'm loosing that pulse from the points when they are opening and closing with the leads connected at the "+" coil terminal.
Is this normal? Perhaps the pulse is still there, and I'm overthinking this? I have not started the car yet (always had the center wire removed from the distributor during these tests. I do not have enough hands to crank the starter and hold the end of the coil wire to ground to see if I have a fat spark. Just asking if I should see the "open/close" indication at the "-" of the coil terminal (using the ohm meter setting) with the "+" terminal coil wires installed.
Never argue with an idiot; they'll only drag you down to their level, then beat you with experience.