I have a lincoln navigator 2004, on some occasions, when i try to start it nothing works, no interior lights, no start no crank , nothing. Seems like all dead. But then suddenly after an hour or two, it starts working like nothing happened. Later on when i m driving it dies randomly and turns back on when i start it right away again, anybody with this problem? Please help, i am suspecting it to be a ground problem or an ECU problem

i replaced battery six months ago, also i replaced alternator 10 days ago. This problem was rare before my alternator went bad. After getting a brand new alternator, it started happening almost everyday.

Yes i was right there , when my mechanic replacedd it. He disconnected the battery

Sure, i will go through the wiring harness today, i will see if there is any crack or something, i will surely let you know if i find one. And also, the day i posted this thread, absolutely no power after that. Navigator has a sensor, which brings the air suspension down, when the truck is not in use, the air in the air bags is still full, and truck is still standing high, which makes me think that the air suspension is also not getting power from the battery or whatever source it is related to. Thanks for all your help, once i check the wiring i ll text you back.

As @alloro mentioned, i have made sure every wiring, i notice 4 ground connections, all seem nice and strong. Today i checked the battery, unplugged it and try it using my honda civic positive and negative, everything was working normal. Honda Civic started right up. So battery issue is eliminated. Wiring is strong. The only problem i am suspecting right now is dead pcm or bad positive connection.

Thanks

Thanks alot @rla2005, this means that i am not spending thousand dollars on a new PCM. Do you hav eany idea, where should i start looking for wiring?

also, my navigator wont start now, its been like this since i started this thread. No luck at all. Its complete dead. I dont know what to do, its a tough situation. I cant even concentrate on work lol

So finally, i towed my truck to my mechanic. Paid 80 bucks for towing.

What i got in return:

Good news : Mechanic concluded the negative terminal for the battery was lose, so mechanic tightened it up, (easy fix) and got it running again. The moment he did that, bang! Power is back AGAIN.

Bad news : i left that terminal loose, while i was working on the battery, before that it was strongly tightened up. And still my truck was playing out no power game. But once it reached mechanic, nothing at all. He touched nothing just the positive terminal and the negative. He figured out negative was lose. But the bad news is i am still not sure if this was my problem, cause it was tight before and truck was still giving me problems.

I wasted 80$ to get it towed anyway though.

Please help