1977 F150 460. I'm a rookie and I'm baffled. I got everything working fine, but decided to tighten up the alternator cable. Then crazily now I have no spark. I can't imagine they are connected. I replaced the coil, distributor cap, rotator, and plugs. I have voltage at the coil connectors but I'm not sure how to check voltage coming out of the coil or how to make sure it is working through the distributor. There is no spark at the plugs. Anyone have some ideas that I can start to track down my problem.

 

Do not attempt to measure voltage coming out of the coil, and stop replacing parts. I hope you kept the previous parts - there's probably nothing wrong with them. If you intend to keep driving this truck & repairing it yourself (which is the only economical way to maintain it), you should invest in a Haynes manual, and read it cover-to-cover at least once. It explains how to test everything using common tools. You'll need a digital multimeter, 12V test light, some jumper wires, and basic tools.

 

I would look at either the ignition solenoid of the ignition module.

https://itstillruns.com/troubleshoot...-12174178.html

 

There's battery voltage on that alternator stud and you could have shorted something when you had your wrench on it.. Use your DVM to check if it's still there because there should be a fuse link on that line.If you are going to do any continuity and resistive in circuit tests, pull the negative lead off the battery before you do anything.
It could just be coincidental, but I would seriously look at the Duraspark module. I believe every vehicle I have owned with it, had to be replaced at one point. If you determine yours is bad, pay attention to the grommet color on its wiring pigtail. The new one has to be the same color.