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Old 08-18-2013, 16:29   #1 (permalink)
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Battery Drain in Ford F150

I have a 2003 Ford F150. My truck's battery was draining whenever I drove it. I had the alternator and batter tested. The alternator failed so I replaced it with a new one. However the problem did not got away. The battery light is still on and the battery will still drain when my truck is on. All of the connections between the alternator and battery are good. What could the problem be?
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Old 08-18-2013, 17:12   #2 (permalink)
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Re: Battery Drain in Ford F150

If the battery light is on while its running I would recommend unplugging the push on connector and see if the light now goes out. If so the new alternator may be bad. The wire that controls the light is grounded by the alternator if a problem with the voltage regulator is detected. If you unplug it and light stays on you have a short in the circuit. I don't have a diagram in front of me to give wire colors but its a start


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Old 08-18-2013, 17:14   #3 (permalink)
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Re: Battery Drain in Ford F150

Have the second alternator checked. You may have a bad one. Have the battery checked as well, often a deep discharge will kill an older battery.
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Old 08-18-2013, 17:18   #4 (permalink)
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Re: Battery Drain in Ford F150

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Old 08-18-2013, 17:22   #5 (permalink)
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Re: Battery Drain in Ford F150

It can't be the new alternator because I had it checked before I left the store with it and it tested good. But when I do unplug the alternator, the light does go off.
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Old 08-18-2013, 19:03   #6 (permalink)
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Re: Battery Drain in Ford F150

The regulator puts the ground on the lamp to light it.
You have no other choice but the alternator.
Good luck.
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