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Re: f150 supercrew cab won't start,,battery good
If you're using your truck to jump start another dead battery in a different car..your truck should be runing when you do that.....
If you leave your truck turned off and are jump starting another car/truck that way..you are drawing your CCA (cold cranking amps) way down, and really shortening the life of your batery..you'll be needing to get jump started yourslf pretty soon.
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Do you have the tow package on your vehicle? If you do it sounds like your trailer electric brake controller is shorted out (normally mounted under the dash on drivers side). There should be a fuse that controls your tow package either in the fuse panel or as an in-line fuse.
If that isn't it, then I would suggest a clamp on amp meter to help you narrow down what is draining your battery. BUT have you had your battery tested to make sure it is good?
The most common problem is the battery cables aren't making a good connection at thebattery. The only good way to check is to remove the cables scrape them off till their shiney as they connect to the battery and clean the battery posts too. connect them and tighten good and try it out.
As a retired electrical engineer this intrigues me. If you were my neighbor I would put an ammeter in series with the batteery lead to see just how much current is being drawn by the "mystery" load.
When you disconnect or hook up the battery can you see any sparks when the cable touches the battery terminal?
If the battery can get run down over night that is a significant drain.
If there is some sign of spark when you connect/disconnect the battery lead try the following. Selectively remove a fuse in the fuse panel, (starting with the larger fuses, 15A, 20A) and then connect the battery terminal and see if you still have a spark.