Get a12 volt test light (autozone or any part store) . disconnect negative battery. connect light between negative terrminal of batteryand negitive cable if light lights something is useing battery power remove bulbs lighting hood and trunk until test light does not light disconect anything electrical until the test light goes out. if you disconnect alternater and it goes out replace alternator. if this was helpful please leave good feed back
SOURCE: Charging system
change your battery cables and check all wires on the alternator for loose connections, expecially the grounds.
SOURCE: 97 ford explorer alternator connector has 2 wires
there is a fuse in the output line of the alternator, but the colors you describe don't sound right, the only way you could find if one of these wires is ground would be to connect a multi-meter or battery continuity tester to ground and touch each wire(make sure battery is disconnected first) with the other lead and see if its grounded
SOURCE: 87 f250 drained brand new battery
I would first have the alternator checked by an auto electrician to ensure it is working correctly and is providing the correct volume of current. It may be faulty and when driving you will be drawing battery power instead of power from the alternator to run the electrics. This will drain the battery.
Alternators do not last forever and if you are still running the original unit it is likely to be on it's last legs and you will need a replacement unit.
SOURCE: 2002 Ford F250 V10 new alternator good battery but
Does the battery charge even after it drains. Even though it's a new alternator, it could still be bad. The battery could even have a dead cell because it's draining while you're driving. Sounds mainly like the alternator output isn't enough. Internal voltage regulator inside the alternator is usually a big problem, it can't be replaced, except by a new alternator or have yous rebuilt.
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