Service charging system soon message
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1st Gear
Joined: Dec 2009
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Service charging system soon message
This light is making me crazy. Battery voltage at 14.8 when running, message keeps appearing sometimes with the battery light. 6.7 HO 55k miles dual alternators. Top alternator appears new. Batteries both test good, my ICON T8 says generator 2 is making almost 28 volts. Any ideas would be appreciated.
Mountain Pass
Joined: Jul 2024
Posts: 136
Likes: 64
This light is making me crazy. Battery voltage at 14.8 when running, message keeps appearing sometimes with the battery light. 6.7 HO 55k miles dual alternators. Top alternator appears new. Batteries both test good, my ICON T8 says generator 2 is making almost 28 volts. Any ideas would be appreciated.
Cargo Master
Joined: Aug 2012
Posts: 2,871
Likes: 951
From: Kaufman TX
The voltage is too high, voltage regulator problem. SICA526 is right, if you're not sure what to do then take it to a shop. If you continue running with voltage too high it will damage the batteries as well, and other far more expensive components if it worsens.
Lead Driver
Joined: Feb 2022
Posts: 7,975
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I think the second gen is supposed to make 28 volts for the Rapid Heater. If you are seeing 14.4-14.8 at the batteries, then the 28V you see on the other alternator is for a separate system. If it were tied to the batteries you would have voltages all over the place. I don't remember where I saw it, but it requires both batteries and the alternator to power it and its 1400 watts. Has a 125amp fuse too. 14+14=28, so maybe?
It might be normal, but I can't find docs to back up what I heard.
It might be normal, but I can't find docs to back up what I heard.
Lead Driver
Joined: Feb 2022
Posts: 7,975
Likes: 4,055
Maybe this is what I heard that used the second alternator at 28 volts.
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dumdum9599
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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