Ignition Fusible Link Blowing after Lean Burn Conversion
I see here the choke control. Was it shorted or drawing too much current?
Coil connections
Your magnum changes the final leg connecting to the coil positive from Blue to Brown and labels it J3.
(That change color coding goes back to the early 70s)
Regardless, its branch off of the run circuit supplying power.
It (coil positive) measured 14 Volts, assuming the alternator was producing at 14 volts, that's fine.
The coil negative connects to a switch inside the ECU, or points, or in your case the HEI.
In addition to switching on/off, the HEI controls the current flow through that wire.
maybe one of the HEI users can describe that more and how it might appear on a voltmeter measurement.
I see here the choke control. Was it shorted or drawing too much current?
Coil connections
Your magnum changes the final leg connecting to the coil positive from Blue to Brown and labels it J3.
(That change color coding goes back to the early 70s)
Regardless, its branch off of the run circuit supplying power.
It (coil positive) measured 14 Volts, assuming the alternator was producing at 14 volts, that's fine.
The coil negative connects to a switch inside the ECU, or points, or in your case the HEI.
In addition to switching on/off, the HEI controls the current flow through that wire.
maybe one of the HEI users can describe that more and how it might appear on a voltmeter measurement.