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Ford Ranger XLT

How do you change computer chip that causes battery drain like you have left your lights on?

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2006-10-15 21:10:47
2006-10-15 21:10:47

Why is everyone so quick to blame the computer? If everything else works well when the car is running I would not even consider the computer to be the source of this problem? First check the battery. Some older batteries can have internal shorting that slowly drains the charge. Also check the alternator. If you have a diode problem it could be draining the battery. You'll have to find out where the current drain occurs before jumping to the conclusion that you have a computer problem. Especially check after-market installed equipment. To check if the alt. is the cause of your drain. remove the (-) wire from the battery (use a new or charged battery)hook an amp meter to this wire and the other wire from the meter to the ground post on the battery. turn on the meter to read DC amps 0-40. DO NOT START ENGINE. The meter should read around .4 or .7 amps. If the reading is much higher (mine was 5.6) remove the wire from the alt. if the amps drop then replace alt.

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