Battery light always on: 2004 F250 SD 5.4l
Just bought this truck with 233K miles and the alternator is a reman. Battery light is always on and would like some help to get it off. Here is what I have done:
1) Battery has 12.5V when engine is off and 14.4V when rnnign with A/C and lights on. 2) Took alternator to Advance and Auto Zone to have tested. Passed both places. 3) Took battery too and it tested good under load. What else can I do? Thanks, Randel |
Welcome to the site..
Alt basics.. Key in the 'ON' position, voltage is applied through the 3 wire alt connector warning indicator circuit (LG/RD wire~light green/red tracer) to the voltage regulator and the regulator is then turned ON allowing current to flow from battery sense circuit (OG/LB wire~orange/light blue tracer) to the generators field coil. When the engine starts up, the generator begins to generate current through the output circuit (B+ or large alt terminal connection). Since your seeing a charge indication, then the regulator has been turned ON. Once the generator begins generating current, a voltage signal is taken from the generators stator and fed back into the regulator through the stator circuit (S terminal/circuit or WH/BK wire~white black tracer). The voltage feedback signal of generally about half the battery voltage is used to turn 'OFF' the battery warning indicator/lamp. If the warning lamp isn't being turned off on a startup, check for the feedback voltage on the WH/Bk wire. Being it was bench tested and seemed to pass, does the voltage still stay within upper limits on the vehicle in higher RPM ranges with no added in loads? |
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