No spark when cranking

Actually let me just estimate a few

First, notice the upside down "U" on the bottom of the ballast. This orients it as the two halves are different resistances

A.....Far top right "existing wire" is the "ignition run" or IGN 1 coming from ignition. With key in run, this should be very close to battery voltage. THIS WIRE GOES DEAD in crank

B...Clip your meter to the coil + Crank the engine USING THE KEY that is important and read while cranking. You should see close to "same as" battery CRANKING voltage, and in no case below 10, better 10.5 and higher

(This circuit is not properly shown. That voltage, known as IGN2, brown, the "bypass" circuit hooks to the coil + side of the ballast and would be at bottom right)

C...Follow down from the bottom left ballast connector. This side of the ballast, and that wire, are ONLY used in 5 pin ECUs. This is fed "backwards" through the resistor during crank

The circuit path is.........

IGN2 coming through the bottom right of the ballast. Goes up through the right side --- crosses over through the jumper at top --- and back down the wire to the ECU.

I would guess this wire sees as little as 6V during cranking if everything else is normal

================================================

Generally..........

Turn the key to run and check voltage at + and - of coil. Plus side is anywhere from 6V up to maybe 10-11, neg side should be very low, perhaps 1 volt or less

IF THE positive side of the coil is much higher, this might be an open coil, bad ECU, or ECU NOT GROUNDED

Pull loose and work all connectors in / out several times, especially the dist. connector

Inspect the cap / rotor for grease, moisture, rotor punch through, etc. Check for debri and rust, and strike damage to the pickup and reluctor. Check for dist. side play. If you have brass .008" (inches) feeler, set the reluctor gap.

Hook the dist. connector to your meter on low AC volts. Crank the engine. The dist. should generate about 1V AC

Turn key to run, ground first one, then the other wire at the dist. connector leading to the ECU. One or the other (forget which) should generate a spark each time you short and open it to ground.