 Alternator/Voltage Regulator issue, Alternator light is on until rpm's increase |
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| PDXMike |
 Jul 26 2019, 09:41 AM
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#1
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Slowly Learning  Group: Members Posts: 111 Joined: 20-December 10 From: Portland, OR Member No.: 12,501 Region Association: Pacific Northwest  |
My alternator light stays on after I start the car. It was dim, and it would go off (and stay off) as soon as I got the RPMs up over 1000 or so. I did eventually find a faulty connection between the battery and the Voltage Regulator, which I thought would solve my problem. Instead, I now have a similar condition except that the charge light is on full bright (not just dim, like before) until I blip the rev's up a bit. It will still go off and then stay off for the rest of the time the car is running.
With the car running at about 1000rpm I am getting 14V at the battery. Pulling the VR and shorting D+ to Df results in 16-17V at the battery, so I am assuming my alternator is good. I thought there was something going on with the VR not applying enough voltage to the field at start-up, so I ordered a replacement. They new Voltage Regulator is an AC/Delco part, not the OEM. I have exactly the same issue with the new Voltage Regulator. Any ideas? Thanks! Mike |
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| Rand |
Jul 29 2019, 05:04 PM
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Yes I know where the term came from long ago. I learn every day. A weak charging cycle is normal? This is when we start to have a problem. Did your car go off the line with a problem? Was it a weak engineering thing? Look at what causes the problems today.
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| Spoke |
Jul 29 2019, 08:33 PM
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#3
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Jerry Group: Members Posts: 6,992 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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QUOTE(Rand @ Jul 29 2019, 07:04 PM)  Yes I know where the term came from long ago. I learn every day. A weak charging cycle is normal? This is when we start to have a problem. Did your car go off the line with a problem? Was it a weak engineering thing? Look at what causes the problems today. Most likely not an issue coming off the line. As parts wear and time takes its toll along with armature brushes wearing, it could be such that a very low RPM startup could keep the alternator from bootstrapping and getting into regulation. My 914 with 2056 w/carbs will idle very low (300 RPM) when cold. The alternator gets started but because the battery has just been stressed with starting, I don't get full 14V until I rev the engine to about 1200 RPM or more. The voltmeter will read around 13V until the engine is revved a couple of times then it stays at 14V for all RPM ranges. |
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Posts in this topic
PDXMike Alternator/Voltage Regulator issue Jul 26 2019, 09:41 AM
914Sixer Do you have a spare relay board to swap out? This ... Jul 26 2019, 10:21 AM Spoke If the alternator works all the time when running ... Jul 26 2019, 10:34 AM 904svo Try cleaning fuse #9 connections, this fuse supply... Jul 26 2019, 11:39 AM Rand I haven't heard of bootstrapping a 914. It is ... Jul 26 2019, 02:50 PM
mikesmith
I haven't heard of bootstrapping a 914. It is... Jul 28 2019, 11:15 AM Chi-town Usually most alternators won't excite till 700... Jul 26 2019, 03:52 PM PDXMike I'll check and clean the number 9 fuse, the gr... Jul 27 2019, 04:53 PM SirAndy What engine? My /6 does the same thing and i have ... Jul 27 2019, 11:22 PM PDXMike '75 with a 1.8.
What engine? My /6 does the ... Jul 28 2019, 10:34 AM porschetub
What engine? My /6 does the same thing and i have... Jul 30 2019, 08:48 PM |
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