1989 2.9 ranger no spark

[Jim Wright]

So after doing a little investigating. I found I have no 12 volt at positive side of ignition coil. Checked all fuses, all good. My problem is the wiring diagram shows power from ignition switch to coil. I replaced ignition switch still no 12 volts to coil. I am wondering if the positive side of coil gets its supply of 12 volt power from someplace else than ignition switch. Lastly, the power wire that feeds the coil also feeds other components. So basically I'm screwed until I figure it out. Thanks for any insight.
Ranger 2.9

 

[RonD]

Should be a Red/Light Green stripe wire that has 12volts with key on, it splits to a few things
yes, comes from ignition switch, no fuses, has fusible link that supplies all the 12volts to ignition switch, so nothing would come on with key on if it was the issue

TFI Module has the same red/green wire, test it for 12v

Also same wire turns on EEC Relay, which turns on computer

Also powers the O2 heater, red/green wire

 

[Jim Wright]

So after doing a little investigating. I found I have no 12 volt at positive side of ignition coil. Checked all fuses, all good. My problem is the wiring diagram shows power from ignition switch to coil. I replaced ignition switch still no 12 volts to coil. I am wondering if the positive side of coil gets its supply of 12 volt power from someplace else than ignition switch. Lastly, the power wire that feeds the coil also feeds other components. So basically I'm screwed until I figure it out. Thanks for any insight.
Ranger 2.9

Thanks for comeback. Got power to ignition coil found bad wire in circuit. Still no spark from coil. Figure it's TFI or coil itself will keep you posted. Thanks jim