Bad Altenator?
Thread Starter
Rennlist Member
Joined: Oct 2010
Posts: 1,337
Likes: 68
From: Memphis, TN 1987 S4
Bad Altenator?
My dash readout never reads above 12v and then stops registering at all while driving. Sometimes it will pop back up to 12v but never more. Today when cranking, I got a warning that showed the battery (can’t remember the wording), but it fired right up. The battery was purchased in Jun. Does Autozone check altenator while it’s on the car?
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Joined: Jan 2003
Posts: 16,942
Likes: 1,044
From: Double Oak, TX
Gauge is generally useless but just use it as a guide.
Measure the voltage at the jump post to ground. That will tell you what is really going on. Should read about 13.5 v at idle with nothing substantial turned on electrical wise.
Is the cooling duct in place and OK. Hot alternators produce less voltage.
Measure the voltage at the jump post to ground. That will tell you what is really going on. Should read about 13.5 v at idle with nothing substantial turned on electrical wise.
Is the cooling duct in place and OK. Hot alternators produce less voltage.
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Thread Starter
Rennlist Member
Joined: Oct 2010
Posts: 1,337
Likes: 68
From: Memphis, TN 1987 S4
Engine strap & ground straps are new. Just a note, it wasn’t reading at all when I got it from the PO. New harness and it began to register “sporadically”. Roger, thank you publically for all of your help & counsel (keeping me from spending $).
Im no good with electrical. So I crank the car and without any additional load and measure the voltage at the jump post. I have a multi meter now just have to figure out which setting to put it on. LOL
Im no good with electrical. So I crank the car and without any additional load and measure the voltage at the jump post. I have a multi meter now just have to figure out which setting to put it on. LOL
Trending Topics
Rennlist Member
Joined: Apr 2006
Posts: 35,695
Likes: 511
Originally Posted by awilli6
Car idling and reading 13.86. Cooling duct connected correctly. Just crazy behavior of my dash reading I guess.
I looked at your volt meter and went cross eyed. Been a while since I've looked at one with so many options. Catch me next year and we can goof around with yours and mine.
Nordschleife Master
Joined: Jan 2013
Posts: 5,943
Likes: 322
From: Kaukauna Wisconsin
It's an affliction.
And for both Sean & Roger, well educated customers are far better to work with.
The bit of effort put in to educating folks pays itself back 10 fold (or better) in reduced headaches & frustration.