When diving down the road the truck just dies and if I jump it, it starts right up. We changed the battery and the alternator. Still not charging the battery. We saw that one of the fuses was blown so we stuck a relay in and that worked for a while and today it blew the relay. At this point we are completely lost to what is wrong with the wiring.
Fusible link blown ? With a voltmeter check for B+ voltage at the heavy gage wire on the back of the alternator .Is the charge indicator light lit on the instrument cluster . Do you know what a wiring diagram is ? Free wiring diagram here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size. Under system click engine ,then under subsystem click charging . Click the search button then the blue link . Watch video on youtube checking alternator electrical .Power & ground !
Functions of an Alternator in vehicle
How to Test an Alternator
SOURCE: 2000 Ford Ranger Alternator
have the alt tested there not very good do you have 12 volts going to the big wire on the alt and with key on you should have it to a small wire going to the regulator to turn it on
SOURCE: 1996 ford f250 diesel truck alternator
has anyone thought about the regulator, i think that its built into the alt, replace it and then see if the prob continues, you can get a pass on the alt test and still have a bunk regulator
SOURCE: !989 Ford Ranger running problem
try checking the voltage regulator
im not sure where itis exactly
but try getting that checked out
SOURCE: 1992ford ranger -alternator dont charge battery
If there is power to the big wire that is bolted on to the back of the alternator and no power out of the small wires that plug in to the alternator then it is possible you need to replace your alternator. start the vehicle and check to see if there is 14 volts at the battery while the vehicle is running if there is then the alternator is good if not replace your alternator and charge your battery with a charger to make sure you have a proper charge on the battery.
SOURCE: Draining Battery on 1996 Ford Contour
you will need to do a test with a battery light disconnect the negative wire on the battery and connect one end of the test light to the battery and the other to the terminal with everything switched off if the test light is lit you have a draw if it is not lit then it is something else sometimes door switches and glove box switches wear out and need added lift to properly shut the open circuit down
I had my
ford 91 ranger checked and both were good, plus alternator was in the green? But
kept killing batteries and would not start without a jump. I replaced solenoid,
starter, and battery. Finally removed the alternator and the BRUSHES were
making contact just enough to keep my truck running, but when lights or any
other accessory was used the truck would quit. New alternator and starts every
time and can run all accessories without problem. Check the brushes on the
alternator.
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