I have a 1998 ford expedition 4x4 5.4 alternator good but seems not to charge battery

Asked by Sep 03, 2016 at 09:30 AM about the 1998 Ford Expedition 4 Dr Eddie Bauer 4WD SUV

Question type: Maintenance & Repair

My 1998 ford expedition has a problem whit
alternator being good already tested at auto zone
and it's good but I put a good charged battery on
the truck turn the truck on and just let it on until it
drains the battery cause it seems that it's just
working whit the battery!! And not the alternator!!
And if I take the negative cable off while the truck
is on the truck turns off as soon as I disconnect
that cable !!

3 Answers

775

CHECK THE MEGA FUSE FORM THE ALTERNATOR. TRACE THE POSITIVE CABLE FROM THE ALTERNATOR AND THERE IS USUALLY A MEGA FUSE IN BETWEEN

254,425

Try this test, with the SUV on and running in idle, probe the battery with your multimeter, are you getting around 14V? 12.3V with the SUV off? That will tell you the charging system is working properly. If it wasn't the battery light will be lit on the dash. Also , it's not a good idea to remove the battery cables while the vehicle is running.

775

THIS WIERE DIAGRAM SHOULD HELP

Your Answer

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