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Gen Light coming on with AC

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Old Aug 14, 2018 | 10:51 PM
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Default Gen Light coming on with AC
I recently purchased a 96 ram van 5.2l and when I turn on the car and have the AC going to battery dips down to 10-9 volts and the GEN light comes on. If I turn it off the battery gauge goes back up to 12.5 or so where it should be. I had autozone check the battery and alternator and said battery is getting older but alternator tests were fine.

If I drive for a bit and turn the AC on the volts stay as they should 12.5 or so.

any idea why the GEN light would be on and how to fix this?
 
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Old Aug 15, 2018 | 07:24 AM
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Compressor may be going bad and putting too much load on the engine.
 
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Old Aug 15, 2018 | 08:21 AM
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Thanks for the reply here.

Yeah that would make sense. The weird part is it only seems to happen on startup if I run the AC. If I have been driving for 5 or so minutes then turn on the AC battery level stays normal and no GEN light...
 
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Old Aug 15, 2018 | 10:13 AM
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You should see over 14 volts with the engine running.
 
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Old Aug 15, 2018 | 11:42 AM
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Thanks HeyYou Looks like I need a new battery. Appreciate the help here.
 
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Old Aug 15, 2018 | 12:02 PM
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The belt is slipping.
 
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Old Aug 15, 2018 | 09:58 PM
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Originally Posted by alloro
The belt is slipping.
the alternator belt? Do I need a new belt or new alternator or both?
 
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Old Aug 16, 2018 | 07:37 AM
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I would start with the belt. If they are all the same vintage (assuming v-belts) replace them all.
 
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Old Aug 16, 2018 | 10:04 AM
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Originally Posted by HeyYou
I would start with the belt. If they are all the same vintage (assuming v-belts) replace them all.
So That is the Serpentine Belt. What all other belts should be replaced? Would you be able to list them out?
 
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Old Aug 16, 2018 | 02:37 PM
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If you have serpentine belt, then there should only be one.
 
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