Acceptable voltage discrepancy, Voltage at dash vs. voltage at battery |
|
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. |
|
Acceptable voltage discrepancy, Voltage at dash vs. voltage at battery |
98101 |
Nov 24 2017, 06:26 PM
Post
#1
|
Michael in Seattle Group: Members Posts: 373 Joined: 7-October 17 From: Seattle, WA Member No.: 21,495 Region Association: Pacific Northwest |
I started my car after sitting a few days and noticed the dash voltage meter went up over 15V. In Tech Tips 700 I read that overvoltage could lead to battery acid spills, so I quickly shut it off.
Prior to that, I'd noticed the dash gauge reads lower than I'd like when all the lights are on. I checked the voltage at the battery under different circumstances and they weren't so extreme in either direction. So now I'm wondering what the acceptable differences would be before you'd start to expect a poor (ground?) connection somewhere? https://www.youtube.com/watch?v=S6BcQC-cjXo |
Spoke |
Nov 25 2017, 08:29 AM
Post
#2
|
Jerry Group: Members Posts: 6,986 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
Short bursts of 16V on the battery should cause no issues. Long exposure to 16V is not good as it would overheat the battery.
To fully understand what is going on the electrical system and layout must be known. That ammeter should be wired from alternator to cabin to battery as Mike mentioned. If not, it would only measure the draw of the accessories in the car. Do you have a schematic of how the ammeter is connected? Also, when you saw the 16V, was it stable or bouncing around? |
Lo-Fi Version | Time is now: 24th May 2024 - 10:58 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 ... |