Jump to content
CaddyInfo Cadillac Forum

CHARGING SYSTEM


Larry

Recommended Posts

I have just replaced the alternator and bat on my 96 deville. My driving voltage is around 11.4 to 13.2 varied. Took it to auto zone ,the system was at 13.7 at idle everything was fine.. But while driving and stoped at light in drive it goes to 11.7 or lower and I have not seen 13.7 , I hope I didn't damage the new alternator using the bad battery before I replaced it. Any thoughts, thanks, LARRY

PS The computer does not say anything. I replaced the alternator because I heard noise and the voltage was 11.7 varied but would not really go up,and the lights seemed dim ,but no computer warning of any type .And after the alternator replacement, found out my battery was bad.

Link to comment
Share on other sites


Is that the voltage you see on the driver info center or one you measure directly on the battery?

as far as I can tell its similar to my digital volt meter measured on battery post, yes there may be a slight differnce, thanks, Larry

Link to comment
Share on other sites

I posted an extensive thread on this a while ago.

Heat is the alternator's worst enemy, as an alternator gets hotter, its output decreases, it is not uncommon to see the 11.7 volts you are seeing in the summer months with the AC, lights, radio, wipers on at red lights and in traffic

I will see if I can find that thread

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

I posted an extensive thread on this a while ago.

Heat is the alternator's worst enemy, as an alternator gets hotter, its output decreases, it is not uncommon to see the 11.7 volts you are seeing in the summer months with the AC, lights, radio, wipers on at red lights and in traffic

I will see if I can find that thread

THANK YOU, I think you hit it right on, it was 95 degrees and very hot. When the car first starts in the hot weather ,it was 13.7 ,but as it got hot it reduced somewhat. I replaced the alternator because it was making a noise and volts were not going up and down as much as I would like to see. This all started after a week vaction and the caddy sat at home. After getting this fixed the car overheated to the extent it wanted shut down. Of course I was out of town and my wife gives me a call on the way back from work. At this point I think it may be thermostat. I will install tomorrow. Thank you , LARRY

ps. and of course my lights are on all the time when car is in drive or reverse so I know this puts more of a load on the system, alternator.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...