Charging question on a 914-6 |
|
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. |
|
Charging question on a 914-6 |
db9146 |
Jul 28 2018, 08:11 PM
Post
#1
|
Senior Member Group: Members Posts: 953 Joined: 21-December 04 From: Atlanta, GA Member No.: 3,315 Region Association: None |
Well, I have made a temporary conversion of my -6, inserting a rebuilt 2.7S with ITBs, MS3, and distributorless ignition in place of the tired 2.0L. Before putting the engine in, I decided it best to install a new alternator along with a new engine/alternator wiring harness.
The alternator is for a 1965-1977 911 2.0-2.7 that uses an external VR. and here's the new wiring including a new ground strap to the engine case. The large red cable goes to the starter, the smaller red wire is D+, the black is DF, and brown is D-. I thought the problem might be the battery because of its age but when I checked the output of the charging system at the battery, there was none. I replaced some of the dash lights with LEDs but made sure not to replace the GEN warning light, which is not coming on despite the alternator not charging. Should I next pull the D+, DF, and D- plug and check for alternator output across DF and D+ momentarily? If there is output, what then? If not, what's next? |
larryM |
Aug 19 2018, 10:29 AM
Post
#2
|
emoze Group: Members Posts: 891 Joined: 1-January 03 From: mid- California Member No.: 65 Region Association: Northern California |
given everything you have reported above - consider DD's idea of bad diodes 6. Check for Alternator AC Voltage Leak Alternators use diodes to rectify alternating current produced by the alternator into direct current. When one or more diodes go bad, the alternator can cause all kinds of problems. AC voltage leak can cause your lights to dim and drain power from your battery, for example. Usually, you can detect this leak by measuring AC voltage across the battery posts using a digital multimeter. Start and let the engine idle. Set the parking brake and your transmission to Park (automatic) or Neutral (manual). Set your meter to a low AC voltage range and take your measurement. If you detect even a small amount of AC voltage, replace the alternator. Once you've determined the condition of the system, you can go over the next section to zero in on the potential problem(s) that may be causing the condition of the charging system. https://axleaddict.com/auto-repair/Alternat...Troubleshooting then see - IV. Troubleshooting for Unusual Charging System Voltage Drops |
Lo-Fi Version | Time is now: 2nd June 2024 - 07:08 AM |
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 ... |