Having problems with your 2001 Ford Ranger Regular Cab ?

Battery won't charge when car is on. Battery is fine. Believe it's a problem with the wiring

Posted / edited by AnonymousUser on : 14-09-2020

Answers :

Hello There:
it sounds like you may have a bad alternator try by testing the alternator with a volt meter you will have to start the truck and set the meter touching the positive and the negative battery clamps at the same time if alternator is good you should have a reading between 13 and 14 volt if reading is less than 13 volt replace the alternator if its good you may have to chase out the wiring for the charging system hope this help you out sincerely D.Jones

If the alternator has been bench tested and passed then you need to check the big wire for 12volts at the alternator. If you have 12 volts then you need to trace the other wire to the PCM. The charging system is computer controlled and its possible the computer is the issue. To diagnose this correctly go to mitchell1diy online and pay the ten bucks for all the proceduers and wiring diagrams. If the charging system light is off then try this. Charge up the battery. Then turn the lights on for a couple minutes to drain the surface charge. Then using a 12v meter hooked to the battery check the draining voltage while cranking. A good battery will maintain a 12 or better voltage even if the truck does not start. If it goes down fast then the battery is bad. Alot of times when a battery is tested using a professional tester they pass. You may need to remove the fuel pump relay so the truck does not start for this test since your testing the cranking amps. Also with the key out of the ignition and doors locked and the negative unhooked at the battery you can check for parasitic drain. Using a amp meter hooked up inline battery to cable you should have less than 1/10th volt. If any more then you have a component not shutting off. Pull fusses 1 at a time till you find the system thats the issue. Watch the meter as you pull fuses
Repair Help & Product Troubleshooting for 2001 Ford Ranger Regular Cab

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