 Intermittent Alternator Light |
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| yeahmag |
 Mar 21 2022, 11:22 AM
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#1
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Advanced Member  Group: Members Posts: 2,479 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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Got a strange one... Alternator light started flickering on my way to this weekends autocross. This was on the highway at steady rpm of around 4K. I hadn't seen it flicker like this before: sometimes on dim, sometimes on for a few seconds at a time, sometimes flickering.
I figured I'd just carry on and hope I could make it through the event. As I pulled off the freeway on to surface streets the light went off and didn't come back on for the duration of the event. Packed up and headed home and only had a brief flicker or two while on the highway. I've never seen it come on while on surface streets or at idle. I figured I'd check the alternator for AC voltage (failed diode) and maybe change the belt (which I personally run on the loose side and is probably aging out). Anything else I should look for? Almost feels like a marginal VR, but I've never had one fail in this way. Thanks! -Aaron |
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| 914Mels |
Mar 22 2022, 08:19 PM
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#2
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Member Group: Members Posts: 357 Joined: 20-June 11 From: Santee Member No.: 13,221 Region Association: Southern California |
The shorter the brushes get the less the spring tension is pushing them down. Higher rpms will kick them up off the rings.
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Posts in this topic
yeahmag Intermittent Alternator Light Mar 21 2022, 11:22 AM
Spoke ...the belt (which I personally run on the loose s... Mar 21 2022, 11:41 AM
emerygt350
...the belt (which I personally run on the loose ... Mar 21 2022, 12:18 PM yeahmag I'm leaning heavily towards the VR at this poi... Mar 21 2022, 12:20 PM emerygt350 I recently installed a hella solid state, very imp... Mar 22 2022, 05:51 AM yeahmag
I recently installed a hella solid state, very im... Mar 22 2022, 10:41 AM vitamin914
[quote name='emerygt350' post='2989984' date='Mar... Mar 23 2022, 12:48 PM emerygt350
[quote name='emerygt350' post='2989984' date='Ma... Mar 23 2022, 01:07 PM 914Mels If it's an old alternator with lots of miles y... Mar 22 2022, 10:50 AM yeahmag Totally unknown on the age and mileage. Always bee... Mar 22 2022, 07:40 PM Spoke You could run some simple tests with engine runnin... Mar 23 2022, 11:57 AM |
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