Battery light stays on, battery gauge says ok, battery goes dead, Why???

Asked by Jan 09, 2015 at 09:21 PM about the 2001 Ford Expedition XLT

Question type: Maintenance & Repair

Replaced battery, Alternater, and Siloniod still battery light stays on and battery is draining

2 Answers

765

you may have what is called a key off current draw. Something circuit is still draining battery with the key off. connect an amp meter to battery wires, then start pulling fuses, until the current draw stops, then that circuit is suspect. Sears used to test charging/battery systems for free. You may want to check with them. It seems you missed the voltage regulator. Did you check if the running voltage is at least 13.7-14.2volts, If not the regulator is suspect. As per usual, check all connections, grounds, etc. Good luck.

4,745

Go to most any major auto parts house and they will run an ODB-II test on it for free.

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