dhodges45

Ok,

Check charging system light started coming on Friday. I went to the auto parts store and had them check the alternator since my battery is only 5 months old. The alternator wasn't charging so I replaced it today. The light is still coming on and when you run the system test on the dash it says check charging system. When I took the old alternator core back I had them check the new one just to be sure that it wasn't bad too and it is charging fine. I put my battery charger on to make sure the batt wasn't just low on amps since it has been four days since the light came on so I'm waiting a few hours on that but I thought I would see if any of you had any thoughts?

Darby

edwin108

My truck did this when I bought it. The used car dealer I bought it from installed a parts-store alternator that was charging (14+ volts), but the battery light wouldn't go out. I finally got it to turn off by installing a Motorcraft reman alternator. I guess some rebuilds aren't as good as others.

dhodges45

That's what I'm afraid of. Do you know what the alternator should be putting out?

edwin108

As long as your voltage is around the range 13.8-14.2V, it should be fine. The light is annoying though.

solpushcart

I had the same problem. As I found out, the plug in the back of it has like a small rubber gasket. Somehow as I was plugging it in, the gasket rolled a little and was blocking connection to one of the pins.
It's like an oblong "O" ring. Check that before you get too far.