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Noticed that my battery light would flicker on and off randomly at times for the past few weeks. The battery meter on the dash will also wave slightly. It only does this when I have been driving it for a bit and am stopped at a stop light. When I am driving, the needle on the meter stays fixed and doesn't move like normal. Nor does it flash when driving, only when coming to a stop or idling at a stop light.

I pulled my battery cables and cleaned the connectors and terminals to see if that was the problem. They were pretty clean to begin with and it didn't change anything. Does this mean that my alternator is possibly going out? The truck is 256k on it and it has never been replaced. Or is it some other electrical problem I am having? The batteries are good in it as well. It just started doing this 2 or so weeks ago.
 

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Did you check the connections on the alternator itself?

Other than that it could be heat related internally in the alternator and if it has never been replaced it could be the problem.
 

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Pull the regulator off the alternator and look at the contacts for it. Mine were toast when the voltage was fluctuating at random times. New alternator solved that problem for me. Cheers!
 

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Also if I remember correctly.... seems less and less these days... there is a plastic female plug that clips into the top of the alternator. With vibration over time the connector inside the plastic plug will wear. Unplug and pinch the connector (once you get it out of the white plastic protector), so that it grips the blade inside the alternator snugly. Reinstall.
Cheers.
j
 

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My alternator output voltage is low on startup after a minute or so at idle it goes to normal. 97 F350 with 317k.
That is normal.

The glow plugs will stay on for up to 2 minutes after starting and they pull a lot of amps where the alternator can not keep up with until the glow plug shut off.
 
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