Red Battery Light / Alternator? - Ford Powerstroke Diesel Forum
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Old 11-12-2010, 09:32 AM
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Red Battery Light / Alternator?

My red battery light is on my dash and is lit. Both batteries are brand new so I don't think its them. The truck always started right up and after letting it sit overnight it cranks for longer now.

1. How do I test the alternator?
2. How easy is it to replace the alternator my self?
3. Which one should I get. Is it better to go the with the larger old 3g case instead of the new 6g.
4. How many amps should I go with. I run alot of stuff like amps,100 amp compressor and other stuff. I guess Heavy duty over standard duty cause the diodes in the bridge rectifier.
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Old 11-12-2010, 09:35 AM
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The light you're seeing is for your alternator. Easiest way to check is to test voltage through your cig lighter or power port.

My recommendation from personal experience is a 200a alt from High Output Alternator, 200-250-300-350 Amp Alternators, high output alternators, Delco Remy,Ford Truck Alternators
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Old 11-12-2010, 09:45 AM
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I thought autozone will test that for you for free right in the parking lot.
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Old 11-12-2010, 10:38 AM
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Fairly easy to remove and replace the Alternator, on driver side, grab belt in between the alternator and belt tensioner, pull belt outward toward the battery and at the same time using your free hand push the clip on the underside of the tensioner ; Clip located at about the 7:00 clock position, upward to lock in place. Remove three bolts, take alternator off, of course remove all the electrical wiring. Takes about 15 minutes to remove and replace. Don’t forget to disconnect your batteries….. You can do the same by placing a ˝ drive socket onto the belt tensioner and move up or down to release the tension on the belt. I find it easy to pull it outward and just use my free hand to push the clip up to lock in place. Hopefully this helps. Had to replace mine yesterday for the very same thing, no more red battery light.

BTW, Advance or Autozone does test your alternator for free while still in the vehicle.
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Old 11-12-2010, 10:47 AM
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Quote:
Originally Posted by Snake View Post
The light you're seeing is for your alternator. Easiest way to check is to test voltage through your cig lighter or power port.

My recommendation from personal experience is a 200a alt from High Output Alternator, 200-250-300-350 Amp Alternators, high output alternators, Delco Remy,Ford Truck Alternators
do you have to do any modifications? Or is it direct fit?
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