Battery Light
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Joined: Oct 2008
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Battery Light
I have an 05 Ranger with 4.0 engine. Lately if I punch the throttle to pass, or the transmission kicks down going up a hill, the battery light will come on until the rpm's drop back down. Good battery, clean tight connections, tension on belt is correct. Any ideas what's going on?
Elder User
Joined: Nov 2006
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From: Lynchburg, VA
Suggest you get the alternator tested, though at 3 years old it should not be failing. Consider my experience in the thread below and the excellent feedback I received from the members.
https://www.ford-trucks.com/forums/6...ably-dead.html
https://www.ford-trucks.com/forums/6...ably-dead.html
Postmaster
Joined: Jul 2005
Posts: 3,956
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From: Abilene, Texas
Sounds like the alt maybe bad. Take the truck to the local auto parts store. Most of them do alt test for free. I wouldn't suggest using autozone though. I have had really bad luck with there alt in the past. Might get 2 or 3 from them before you get a good one.
Elder User
Joined: Sep 2006
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I've seen quite a few alternators go bad in a way where voltage drops at high RPM's.
I think this is probably your case.
I've seen a lot of aftermarket alternators for these that had the incorrect Regulator installed. They will plug in and charge just fine, but will cause the BATTERY light to be illuminated. Motorcraft is your best choice, but it can sometimes be cost prohibitive.
I think this is probably your case.
I've seen a lot of aftermarket alternators for these that had the incorrect Regulator installed. They will plug in and charge just fine, but will cause the BATTERY light to be illuminated. Motorcraft is your best choice, but it can sometimes be cost prohibitive.
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