73 240 No spark

[Mark Maras]

 You may have #1 at TDC at the end of the exhaust stroke. Try rotating the crankshaft 360 degrees. The cam lobes will both be up at the end of the compression stroke and the rotor location should be better. Plug wires, 153624.

[Yarb]

That has nothing to do if it’s firing or not another battle for another day. The wire runs right through the tach in series. We Need MEASUREMENTS!!

 

[Shawninvancouver]

Ok. Measurements will come.  But assume with points open there is only power on one side?? Is that correct ?

ohh and if plugs are in wrong order it’s just going to misfire??

Edited May 7, 2024 by Shawninvancouver

[Patcon]

6 minutes ago, Shawninvancouver said:

Ok. Measurements will come.  But assume with points open there is only power on one side?? Is that correct ?

ohh and if plugs are in wrong order it’s just going to misfire??

Let's get it to spark, then worry about plug order. Incorrect order won't damage anything.

[Shawninvancouver]

Just need to know as many possibilities as my car is not at my house. It’s at my pals garage. I only get there a few times a week.  If I wanted to jump over and skip the tach would this work ? From ballast to coil.  ?

[Yarb]

@ShawninvancouverThe biggest issue here is you need to be at the car and follow instructions which we have given. Secondly in the time you are not able to be there, Read, educate yourself on how the system works. I think you are looking for an easy fix and there aren’t any without gaining knowledge. Videos,Diagrams and a multitude of folks are trying to help, There are not any answers without real time measurements step by step. You’re going to end up going down a rabbit hole as we call it here on the forum. Study the FSM it’s the Bible for this car. I apologize if my response is somewhat strong but we are going round and round in circles.

Edited May 7, 2024 by Yarb

[240dkw]

46 minutes ago, Shawninvancouver said:

Just need to know as many possibilities as my car is not at my house. It’s at my pals garage. I only get there a few times a week.  If I wanted to jump over and skip the tach would this work ? From ballast to coil.  ?

Again why are you asking this question? We already determined that the b/w from the coil is not working and installed a jumper exactly where you red line is???

[siteunseen]

@jalexquijano

[Shawninvancouver]

On 5/5/2024 at 10:40 AM, 240dkw said:

Yes that is a problem, you should have power at the coil wire if you have power on the g/w wire. To see if that is your only problem.

1) Disconnect the coil wire, leave the resistor wires as they are.

2) add a jumper from the g/w terminal to the + coil.

3) make sure the points are open.

you should now have power on the - side of the coil, at the terminal on the dizzy, and on the + side of the points.

If all that checks out Ok and still no spark then you are back to a bad coil or wire. Or possibly a bad capacitor on the dizzy.
 

As per this post 240 keep in mind it’s a brand new 1.5ohm coil.  Brand new condenser on dizzy.  I may even put brand new points in.  When you say I should also have power on the terminal of the dizzy what do you mean? The screw that tightens it to mount ? And which is positive side of points ?

Edited May 8, 2024 by Shawninvancouver

[Captain Obvious]

2 hours ago, siteunseen said:

@jalexquijano

  

[Captain Obvious]

6 hours ago, Yarb said:

That's a great drawing showing the ignition system. With the line showing the firewall in there, it does an excellent job of illustrating why you only need one wire on each end of the ballast resistor and why you don't connect directly from ballast and coil. Shows how the other connections are made inside the harness.

Thanks for posting that!  

[240dkw]

22 minutes ago, Shawninvancouver said:

As per this post 240 keep in mind it’s a brand new 1.5ohm coil.  Brand new condenser on dizzy.  I may even put brand new points in.  When you say I should also have power on the terminal of the dizzy what do you mean? The screw that tightens it to mount ? And which is positive side of points ?

Where the wire from the - on the coil is connected on the dizzy and the side of the points that should have 12v the one connected to the spring and the one the red wire in your photo is connected to.