Compression Ignition Addict
Join Date: Jul 2007
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Super Duty charging voltage
Does anybody know what the nominal voltage should be on an 05 Super Duty? My cousin's truck has been getting harder to start, and the bats finally went completely yesterday. We replaced both bats, and the voltage I measured seems pretty low. Most vehicles I've worked on show at least 13V at idle, but his only runs 12.4 or so until you rev the engine up. Then it goes in the 13s.
There's no battery light on, but I'm just concerned something might be wrong. That voltage sounds awfully weak.
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