New Alternator, Now Tranny Slipping? WTF? - Ford Powerstroke Diesel Forum
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Old 04-04-2014, 09:10 AM
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Angry New Alternator, Now Tranny Slipping? WTF?

Put a new alternator on my truck after getting a new FICM with the php80 tune on it. The alternator is a 220amp Meangreen. Before i put the new alternator on the truck ran fine, the battery light just kept coming on and off. So i put the higher amp alternator in it. Now my transmission is slipping bad. The tow haul light flashes randomy and the truck will get stuck in tow haul mode until i restart the truck.

Any ideas what is going on? Really starting to get frustrated.
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Old 04-04-2014, 09:24 AM
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the chances they are related to the alternator are none the 80 hp FICM IDK

did you pull both batteries when doing the work ? just curious it doesn't really point to anything if u did

that flashing is telling you there are codes a decent scanner can read
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Old 04-04-2014, 10:01 AM
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I did pull both batteries when I installed the new alternator. It is just weird that when I put the new alternator in the tranny is messing up now
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Old 04-04-2014, 10:20 AM
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Are there any key things I should be looking for when scanning the truck? minus pulling any codes? Like temps? I don't think the transmission fluid has ever been changed since 2004 and the truck has 126,xxx miles on it. Could this also be an issue?
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Old 04-04-2014, 11:51 AM
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Need to scan, then change trans oil, i think every 60k is trans oil change for normal use.
more often if towing or plowing.
Really need to scan for codes to know what's going on.
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Old 04-04-2014, 11:57 AM
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Is your trans temp gauge bouncing around? Mine did that and it ended up being a bad temp sensor causing the issue.
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Old 04-16-2014, 09:28 AM
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If you remove battery power from the system, transmission needs to go through a relearn procedure.
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Old 04-16-2014, 06:09 PM
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Verify your voltage output isn't too high...
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