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Volt gauge reads voltage for a minute then disappears

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Volt gauge reads voltage for a minute then disappears

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Old 02-12-2019, 08:24 AM
Superdrag73
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Default Volt gauge reads voltage for a minute then disappears

Driving in to work this morning my volt gauge dropped onto the bottom peg. It ran fine and the lights were a little dim but still good enough to not stop. The truck starts up and runs fine every time, but after about a minute of driving it drops to zero on the gauge again. I checked for bad connections and didnít find any. Sounds like alternator to me. Ideas?
 
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Old 02-12-2019, 10:41 AM
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Wait until the gauge drops to nothing, and put a meter on the battery. What's the voltage there?
 
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Old 02-12-2019, 01:13 PM
Superdrag73
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Originally Posted by HeyYou View Post
Wait until the gauge drops to nothing, and put a meter on the battery. What's the voltage there?
I didnít do that, but when itís running if I disconnect the battery the engine dies. That tells me itís the alternator. I could be wrong.
 
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Old 02-12-2019, 01:20 PM
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Originally Posted by Superdrag73 View Post

I didnít do that, but when itís running if I disconnect the battery the engine dies. That tells me itís the alternator. I could be wrong.
That test worked on older systems, but, isn't a valid test on newer systems.
 
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Old 02-12-2019, 03:30 PM
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Originally Posted by HeyYou View Post
That test worked on older systems, but, isn't a valid test on newer systems.
I was afraid of that but a new alternator seems to have fixed it. The thing that threw me was, I would expect the gauge to read 12 volts if the alt wasnít charging, not on the bottom peg.
 
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Old 02-12-2019, 04:29 PM
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Originally Posted by Superdrag73 View Post
The thing that threw me was, I would expect the gauge to read 12 volts if the alt wasnít charging, not on the bottom peg.
Mine did the same thing when it failed...zeroed out. It didn't fail completely either.. it was intermittently working/not.

Alternator failure

 

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