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| OK - I think I did this right. With the truck running I took a wire and touched the BAT terminal (circled in red in the first picture) to the left side post (circled in green) in the 2nd picture.
Unfortunately I don't think it made a difference.
With the truck off I read 12.6V across the BAT and GRD terminals. With the truck running I read 12.3.
I had my wife rev the engine up to 1800 RPM and touched the BAT and 1 post together then took the readings again. Its like the alternator is not even there...no matter what RPM she revs it to, the voltage remains at 12.26. As soon as she shuts the truck off the voltage goes back to 12.6.
Could it be that the batteries are fully charged and the voltage regulator is not allowing the alternator to put anything out?
Thank you for the help so far.
Edited by rollinghorseranch 3/19/2023 11:19
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 InkedIMG_3191 (full).jpg (125KB - 5 downloads)
InkedIMG_3192 (full).jpg (114KB - 1 downloads)
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L8000 Feed Truck Alternator
