Coil and ignition issues = no spark

[440beep]

Recently installed my 440 engine, that ran properly last year. Was pulled to fix an oil leak. (Car is running Mopar electronic ignition conversion and has been issue free for years).

Now, when trying to start, I have no spark from coil, based on coil test lead plug grounded to chassis. When car is off, at the battery, volts are 12.67. At front engine ground wire, same 12.67, and at back engine ground lead, 12.67.

However, with ignition in RUN, I’m losing 0.9 volts at back engine ground, and positive coil lead also reads the same. Im guessing this is voltage drop is the problem? Coil resistance is supposed to be 0.7 ohm and touching coil +- resistance is same, .7 on the multimeter ohm 200 setting. Just 200, no K after numeral.

Also, over the winter I pulled my gauge cluster to refinish gauges and could somethings in there be causing the no spark? Lights and gauges work

Ive read and read all my Mopar electrical stuff, did the troubleshooting, and also read countless posts here to no avail. Even doing jumper wire from battery positive to coil positive does nothing.

Someone posted about hand spinning the dizzy and that should cause a spark, tried that, but sure doing it right.

I’ve tried different new coils, swapped out ECU boxes, new ballast resistor and no spark over and over. Any ideas what I’m missing please?

 

[440beep]

Can the spark testing be done with the dizzy unmounted, like in pic, or does it need to be mounted. Based on certain previous post, it should be able to be tested like this for spark.

 

[Geoff 2]

Yes, you can test with dist out of the engine. Just spin the dist shaft. Check the p/up coil gap, should be 0.008", in case the dist got 'bumped' & the gap moved.

 

[440beep]

And the spark testing wire is connected to the coil or the dizzy? At the coil, no spark.

Yes, you can test with dist out of the engine. Just spin the dist shaft. Check the p/up coil gap, should be 0.008", in case the dist got 'bumped' & the gap moved.

 

[440beep]

Ugh, while troubleshooting, I read this post 20 times and this morning it finally makes sense. Will try this tonight and see if dizzy problem.

 

[440beep]

And this test was useless, still no spark, but I can hear buzzing every time I ground the exposed dizzy plug.

Maybe it’s in the bulkhead.

 

[Sinitro]

The older Mopar legacy ignition parts tend to be very durable..
So 1st I would recommend that U check closely the bulkhead connectors,
take them apart burnish the contacts, tighten the female tab connectors,
coat with dialectric grease and reinstall. Over time these tend to become
oxidized. They deliver voltage In/Out to/from the ignition switch. Over the
years doing this has fixed many, many mopar intermittant electrical/starting issues.

Just my $0.02...

 

[440beep]

What are my tests telling me is wrong?

No spark at coil test lead when jumping battery + straight to coil +?

No spark at coil test lead when doing the above posted dizzy test?

I’ve tested 3 different coils, 1 brand new and 2 others were previously on Bee and worked.