Possible Alternator Issues, Low Voltage Readings |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Possible Alternator Issues, Low Voltage Readings |
mzapisek |
Aug 17 2016, 08:01 AM
Post
#1
|
Member Group: Members Posts: 93 Joined: 10-June 04 From: Syracuse, NY Member No.: 2,188 Region Association: North East States |
Installed the new LED lights on the car over the w/end. Noticed some flickering which led me to start checking voltage readings. I have 3.0 GT clone that I have been sorting through the past couple of years. Car came equipped with the Valeo A14N11 alternator. Currently battery is showing 12.5V at the posts when car is at rest. While running the battery shows 12.3V at the posts. I'm only getting just over 10V at the headlight plug. Obviously this drop in voltage is causing the LED's to flicker.
Bigger question is why I'm not seeing 13.5V when car is running. I've been running the car for the past few months a couple days a week and have had no starting problems so the battery must be getting some charge from the alternator. Is there anything else that might cause the lower voltage readings at the battery while running as well as the voltage drop at the headlights? Really don't feel like dropping the engine to swap an alternator if its not necessary. Additionally I have been trying to solve a stumble in first gear. The car has weber 40IDA3C's. Could the lower voltage condition also be causing a problem with spark at lower RPM's? The car runs strong above 2500rpm but stumbles coming off idle. Sorry for rambling. Having fun working on the car but could use some advice. Thanks. |
mzapisek |
Aug 18 2016, 09:33 AM
Post
#2
|
Member Group: Members Posts: 93 Joined: 10-June 04 From: Syracuse, NY Member No.: 2,188 Region Association: North East States |
Green generator light comes on and goes off in two seconds when the car is started. As I have stated the car has been run since June with no starting problems and battery still reads 12.4V when the car is off. Is there any specific way to test the alternator and confirm its not charging correctly without removing? Would hate to go through the trouble of removing to find out its a good unit. Thanks.
|
porschetub |
Aug 18 2016, 12:54 PM
Post
#3
|
Advanced Member Group: Members Posts: 4,725 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Green generator light comes on and goes off in two seconds when the car is started. As I have stated the car has been run since June with no starting problems and battery still reads 12.4V when the car is off. Is there any specific way to test the alternator and confirm its not charging correctly without removing? Would hate to go through the trouble of removing to find out its a good unit. Thanks. + Your altenator belt is correctly tentioned right?,start the engine and do a full load test headlights ,stereo,fan blower,etc,if you don't have 13.8 volts you have no charging. There is a chance you have a bad battery but I expect you have checked that,good luck |
Lo-Fi Version | Time is now: 24th September 2024 - 12:49 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |