Battery Light Nightmare - Ford Mustang Forums : Mustang Forum
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post #1 of 4 Old 11-15-2011, 02:37 PM Thread Starter
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Battery Light Nightmare

I'm new to the forum and new to Mustangs, this is actually my girlfriend's car. She drives a 2003 GT 4.6 SOHC. I've searched all over about this and can't seem to pinpoint the issue.

It started like this:
Inspection time, service engine soon light on, failed inspection just for the sticker. Light came on for Idle Air Control Valve. Replaced that. New light for camshaft sensor. Replaced alternator with new OEM part from Rock Auto.

This fixed the ongoing issue with the car idling funny once in a while and also seemed to brighten up the interior lights, no more yellow lights inside! Ran great for a a few weeks, then on rainy nights, the battery light would intermittently come on and go off. It never stayed on more than a few minutes at most, sometimes would just flash. It's now consistently on then off, on then off while driving. It will cause the car to buck and feels like it loses power.

Checked the alternator, 14V, everywhere (battery light not on. Can't seem to get it to come on when it's idling) Checked battery, seems to only be at 59% charge. Pulled battery, charged for almost 2 hours, will only hold a 62% charge. New battery, charges fully and seems to hold a charge but the battery light issue remains.

Pulled all grounds by battery, sanded them down to shiny metal, check the ground cable under the car, everything seems to be grounded properly.

What am I missing?

Someone mentioned fusible link? Not familiar with this, where am I looking?
Contacting Rock Auto for a new alternator just in case.

Thanks in advance.

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post #2 of 4 Old 11-17-2011, 07:16 PM
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Not real familiar with an 03, but I would have the alternator tested.

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post #3 of 4 Old 11-17-2011, 08:16 PM
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We have had lots of issues lately with Motorcraft reman alternators and starters. We have had to put multiples on until problem was fixed.

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post #4 of 4 Old 11-18-2011, 11:00 PM
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Buy a reman one from Eagleautoelectric on Ebay. The guy is AWESOME..... I bought my 160A and my old 105A model from him.

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