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post #1 of 4 Old 09-12-2013, 09:24 AM Thread Starter
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Question Battery Light

Today my battery light came on, so I checked the batteries and one battery runs at 14v and the other battery runs at 12.5v. The batteries always used to run at the same around 14v. The battery on the passenger side is the one running at 12.5v Both batteries are only one year old. Did I blow a fuse or something? All help appreciated.
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post #2 of 4 Old 09-12-2013, 09:30 AM
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Not a fuse. Did you make sure that the glow plugs had cycled off before checking these voltages? Which one did you check first?

Where does the voltmeter on the dash read after the glow plugs have cycled off?

It would also be good to know the voltages of the batteries while the engine is off, but you need to isolate them from one another. Disconnect the negative terminal on the driver's side battery and measure the voltage of each battery, with the key out. If you have or can borrow a load tester, it would be good to load test each battery as well; again, you would need to separate them by disconnecting one of the negative terminals.
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post #3 of 4 Old 09-12-2013, 09:50 AM Thread Starter
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With key out and batteries disconnected the battery on passenger side reads 12.5v and driver side reads 12.83v. I started it up and battery light went out. With the truck running I tested The passenger side battery again and on the battery terminals It reads 12.5. But when I put the multi meter on the metal things connected to the battery (forget name) I get 14v. I have another battery I can put in if that would help.

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post #4 of 4 Old 09-12-2013, 10:20 AM
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Quote:
Originally Posted by DieselNic View Post
With the truck running I tested The passenger side battery again and on the battery terminals It reads 12.5. But when I put the multi meter on the metal things connected to the battery (forget name) I get 14v. I have another battery I can put in if that would help.
Sounds like a bad connection between the battery post and terminal clamp. Otherwise, there no reason those readings should be different. if I understand your test correctly.

Disconnect the cables, clean the posts and terminals real good with a cleaning tool. Spray on some anti corrosion and reconnect.

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