 Voltage drop problem |
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| jvmarino |
 Sep 5 2024, 07:38 PM
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Member  Group: Members Posts: 96 Joined: 22-March 09 From: Baltimore Member No.: 10,188 Region Association: None  |
Driving the 914 today I noticed an issue with voltage drop for the first time. Car starts up fine, runs good as usual, but when rpm goes over about 3600, the volt gauge has a noticeable drop down to about 12v indicated. Generator light also comes on. When rpm goes back below 3600, light turns off and volt gauge jumps back up about 1.5 volts.
My initial thought was a loose alternator belt, as I haven’t touched it since rebuilding car almost 30 years ago. Felt the belt and it seemed too slack. So tonight I tackled this project and after about an hour of cursing at the lower 13mm bolt, I finally found a way to loosen it. I get the belt tightened and button everything back up. Fire car up and it still does the same volt drop thing. Anyone here have any thoughts on what the problem is. Car still drives fine, but I don’t want to take it anywhere until this is solved as it would stink if it completely dies on me while using it. Jim |
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| GregAmy |
Sep 17 2024, 06:27 AM
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Advanced Member Group: Members Posts: 2,416 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States 
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Sounds like this one from last week:
http://www.914world.com/bbs2/index.php?sho...=371725&hl= Any time I read "GEN light gets brighter on with more RPM" I immediately go straight to "bad diode in the alternator". |
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Posts in this topic
jvmarino Voltage drop problem Sep 5 2024, 07:38 PM
technicalninja Full field the alternator at 2500 rpm and see what... Sep 5 2024, 07:54 PM jvmarino Well I picked up a good deal on a solid state regu... Sep 16 2024, 04:59 PM jvmarino I am by no means an expert on car charging systems... Sep 17 2024, 12:22 PM
Spoke was due to worn brushes in the alternator.
It alm... Sep 18 2024, 11:43 AM jvmarino
was due to worn brushes in the alternator.
It al... Sep 18 2024, 01:02 PM Spoke
[quote name='Spoke' post='3168494' date='Sep 18 2... Sep 18 2024, 01:43 PM StarBear Yep; same thing with my DD 2009 Camry. Fortunately... Sep 18 2024, 02:05 PM jvmarino Well I finally got around to some testing after so... Oct 5 2024, 01:27 PM Spoke
Well I finally got around to some testing after s... Oct 7 2024, 07:30 AM jvmarino Read through some more old threads on the forum an... Oct 6 2024, 11:29 AM Spoke
Read through some more old threads on the forum a... Oct 7 2024, 07:38 AM jvmarino The GEN light comes on when key is in before car s... Oct 7 2024, 07:38 AM davep While the alternator may have diode issues, please... Oct 8 2024, 09:55 AM |
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