Low alternator charge at idle

[Kern Dog]

I did get the Tuff Stuff alternator and voltage regulator in the car today, then the pesky no spark issue came back. I was able to get it started twice and it did seem to charge more at idle but I needed to let it warm up so it would idle on its own. I don’t have a choke. I shut it down to step away and when I came back, it would start.
I hope to have an update on both issues tomorrow.

 

[Demonic]

Your no spark issue - did you try a different coil?

 

[Kern Dog]

Oh yeah....This issue has been a real pisser to diagnose because it is so random.

Are you ready for a real weird one? Random NO spark from a MP electronic ignition system despite numerous parts swapped around...

 

[Kern Dog]

So far, it has been a good day with the car.
First, I may have determined the issue where the car would randomly have no spark. Now this new alternator seems to work as described.

Here I am with the headlights on along with the A/C fan, the two biggest draws to the system.

Fast idle, about the RPMs I’m turning at 65 mph in 5th gear. Voltmeter reading…

That is great and is more than before. The real test is at idle where before, it read around 9 volts.
Now this is where it was a problem, charging at idle.

The standard 1000 rpms where I set it.

Impressive. I call that a success!

 

[70ChargerRT]

So far, it has been a good day with the car.
First, I may have determined the issue where the car would randomly have no spark. Now this new alternator seems to work as described.

Here I am with the headlights on along with the A/C fan, the two biggest draws to the system.

View attachment 1752438

Fast idle, about the RPMs I’m turning at 65 mph in 5th gear. Voltmeter reading…

View attachment 1752439

That is great and is more than before. The real test is at idle where before, it read around 9 volts.
Now this is where it was a problem, charging at idle.

View attachment 1752441

The standard 1000 rpms where I set it.

View attachment 1752442

Impressive. I call that a success!

That’s great Greg!