My 2000 toyota wouldn't start so I replaced the battery and the parts store tested that it was bad. New battery didn't start car on the first or second try. Third time started. I have never had to step on the brake to start my car, but now I have to, or it won't start. Also, there is a light showing I have a tail light out. Tail light replaced and indicator did not turn off.
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Easy way to check with a voltmeter. Check battery voltage on the battery terminals with key off, engine off, and then check voltage with engine running.
Engine off, a good battery should have voltage between 12.6 volts and 12.9 volts. With engine running, battery voltage should be a minimum of 13.5 volts, somewhere between 13.5 and 14.5 volts. This would indicate the alternator is good and is charging the battery. If voltage is less than 13.5 volts, if it only shows same volts as when not running, the alternator is not working right. Take it off and have tested for free at a parts store. It could be a bad alternator or it could be that the wiring between alternator and battery has a problem. If alternator tests good, start looking into the connections between alternator and battery.
Does your battery or alternator light stay on when engine is running? This would indicate a charging system problem. Time for the voltmeter test.
You either have a defective battery or the battery cable or cables have acid intrusion that has "wicked" inside the cable and this causes a bad connection, the only fix is to replace the cable or cables, this problem is mostly limited to the positive battery cable because of the current flow direction. So 1st have the battery tested and see what it shows, almost any of the many discount auto parts stores will test the battery for free.
you need new bulbs in tail lights one bulb in each side has two elements one works brake other works running lights the elements in the bulb for tail lites are bad . so just replace bulbs. hope this helps.
Have you checked to see if your alternator is charging now and is your solenoid burnt or blown will it crank over? these would be ideal locations to start test battery to to see what it is holding for charge level. Sometime local automotive part stores offer a test program in store like canadian tire test it before you replace it bring in the part and test it!! are you in Canada?
you should remove your alternator and take it into an auto parts store and they can test it for you.
this alt had an internal regulator which can be replaced easy.
your auto parts store will be able to full feld your alt to bypass the regulator. this is how you test it to see if the regulator is bad.
you didnt say how many miles are on this truck .
most of these ford alt will last 120,000 or more
on the back side of the alt you will see the replaceable regulator.