So I have had my Ford F-150 2wd extra-cab Lariat for just a little over 2 years now. It only had about 135,000 miles on it when I bought it. I was trying to leave work yesterday and my truck would not start and I have already done many things due to starting issues in the past. So a few days ago I noticed my blinker changing from a flashing turn signal to just a solid turn signal without flashing. As I was driving to work yesterday, I noticed the volt gauge meter on my dashboard console was twitching back and forth like a fast pendulum or clock. I tried to start my truck later that day during my lunch break and I heard a few clicks when I was turning the keys on the ignition and then it died and wouldn't start. My girlfriend picked up my battery from me which was just a few months old and took it to autozone. They said the battery was low but not in bad condition and they had charged it full. I reconnected the fully charged battery after work and the dome light would turn on when I opened the door but it would shut off as soon I tried to start my truck and nothing electrical would work anymore and nothing electrical would work after one or two attempts to start vehicle. I took battery back to autozone and they said that it was still fully holding a charge at 12.5 volts so I figured the battery was the not the issue. I had also replaced the new battery cable connectors/terminals two months ago, replaced the solenoid starter by the battery with a new one two months ago, replaced the ignition/key switch with a new one two months ago, and replaced the actual main starter less than a year ago. The next day after my truck wouldn't start, I tried starting it again and dome light came on and I heard a few clicks when trying to start it and then everything shut off again and dome light would no longer go on again for a few hours. I tried tapping the starter while a friend tried to turn the truck on and also creating a start with a wire and still nothing. I took off starter and replaced it with a new one and still my truck wouldn't start. Dome light came on and the dashboard lights and then immediately shut off when I actually tried cranking the ignition switch after hearing one or two clicking noises. I checked all the fuses and all the fuses were just fine under the compartment below the steering wheel. I used an ohm meter to check my relays and they were also just fine. So my battery is holding a full charge and is fine, battery connections good, new starter, new solenoid starter, new ignition switch, fuses fine and relays fine, and I can't think what else it could be. I have also replaced all the spark plugs, spark plug cables, and distributor cap. When the dome would work when I was opening door, and then I would turn ignition switch, I could hear the fuel pump engage so I know thats also not an issue. I have been told by several people that my truck should still start even if a bad alternator is the problem since my battery is fine, but my truck does not start at all. I have also been told possibly the voltage regulator and have also been told that the voltage regulator probably isn't the problem. I have been putting a lot of time and money into trying to fix this problem but I am running out of ideas and would appreciate any helpful feedback or ideas on what else I could try or what else could potentially be the problem based on my story above. Thanks fellow Ford F-150 owners and be safe out there on the road.