1977 Ignition Box / Dizzy Wiring Schematic?

[jeffncs]

Trying to get a 77 running… 302/5.0HO, c4 (NSS bypassed for now), new Centech harness, stock ignition, new dizzy with the ford plug. Correct wiring / firing order for the HO engine.

Has spark and fuel. Seems to be at TDC for #1 (used the fancy whistle). Engine cranks strong. Spark at the distributor. Timing set at 12°ish. Refuses to run.

Looking for someone to share the stock 77 ignition wiring schematic. Ignition box to the dizzy and ignition box to the harness (stock or Centech).

Thanks in advance!

 

[DirtDonk]

Interesting. If you have spark, then you are, in theory at least, wired correctly. Or at least 90% correctly. And that’s good enough to run.
You’re verifying 12 BTDC with a timing light? Are you sure the timing marks are accurate?
And you are starting from passenger side front as you’re number one cylinder. Correct?
With distributor rotor rotation, counter clockwise. Correct?

 

[jeffncs]

Interesting. If you have spark, then you are, in theory at least, wired correctly. Or at least 90% correctly. And that’s good enough to run.
You’re verifying 12 BTDC with a timing light? Are you sure the timing marks are accurate?
And you are starting from passenger side front as you’re number one cylinder. Correct?
With distributor rotor rotation, counter clockwise. Correct?

I’ll confirm it’s not 180° out. New HB for the 50oz 5.0 which has the explorer front dress.

This truck has been a little frustrating at times and this is just the next chapter.

 

[Oldtimer]

From my notes:

Broncos used a black (1974), green (1975) or a blue (1976-77) grommet module. The engine wiring harness is different for all three but all the modules will physically connect to it. They will not work though. The one year only parts are very difficult to find and a lot of parts people assume the next year's part is just as good.

 

[ntsqd]

FWIW you can eyeball the timing by setting the damper at what you want for initial timing, and then looking at the reluctor lobe to pick-up coil core relationship. Rotate the distributor until the reluctor lobe is half of it's width past the core of the pick-up's coil.