Need to locate fuseable links 77 F150

[blakeusa]

77 F150

Need some help please. Running out of ideas.

No power to the lights or ignition switch. Ran a tester to the ignition switch terminals and I have no power to any connection to the ignition switch.

Battery & connectors are good and will crank if the solonoid is jumped.

All ran fine before son reversed jumper cables.

Would like a diagram or description of where I could find the fusable links that bring power to the ignition switch and or that that controls the start wire.

I found two off the solonoid/relay- I tested the one 20 gauge fusable link going from the positive battery solonoid connection (to the Alt battery) and that is OK-in fact just replaced. The second one white 5 gage seems to go to the electric choke but seems ok.

System has new alt, solonoid, battery and ground.

Could there be a short/problem with the duraspark control module that would keep any power running throught the system.

Any ideas would be appreciated. Good ideas that is!

Thanks

[Franklin2]

It does sound like you still have a fusible link that is burnt out. They are all under the hood, and over in the solenoid area. You should have a wire going to the solenoid + battery connection that feeds the whole truck. This may have been the same wire that went to the alternator. They configured it a little different through the years. Most years, this was a yellow wire. I would follow the wire(s) from the solenoid + connection through the harness. You should come to a splice, and then after that find more fusible links. The alternator, headlights, and ignition switch/fuse box power all tie into this hot wire going to the solenoid + and they usually all have their own fusible links after the splice.

You should then have a main wire going through the firewall, and then it splits and one side feeds the ignition switch, and the other feeds the fuse box.