Jump to content
CaddyInfo Cadillac Forum

1997 Eldorado 4.6 northstar


Recommended Posts

i have a 1997 eldorado with 4.6 northstar car has 117,000 miles after replacing alternator and radiator last week now my battery wont hold charge overnite! i have checked charging system and replaced battery twice! now im hearing of phatom electrical shorts? anybody ever heard of this?

Link to comment
Share on other sites


First check for codes, look for alternator codes

Have the battery load tested, and clean battery terminals/connections

Any aftermarket audio, amps etc?

Then in a dimly lit area, state pulling fuses with the key off car sitting for 10 minutes, doors closed, and look for a spark at the contacts, that will be the circuit that is causing the problem

Check trunk light, glove box light, vanity mirror lights,

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

The car has two electrical circuits that time out after about 10 minutes of the car sitting undisturbed, the RAP (retained accessory power) and the "inadvertent" power which provides power for the interior lights and such. The difference is that the RAP stops when a door is opened with the key off, while the inadvertent power continues regardless.

If you have a power drain problem it can be caused by the inadvertent power staying on or by something on an always-hot circuit being on when it shouldn't. I have a friend with a Toyota that has a problem with the trunk popping open and the light in the trunk draining the battery; he pulled the bulb until he found it. The Cadillac puts that bulb on inadvertent power to prevent this kind of thing, but if it's caused by the fob getting its buttons pushed in the house, which will turn the inadvertent power back on each time.

Looking at the main battery power distribution on page 8A-10-1 in the 1997 FSM, the battery is connected to the LH and RH Maxifuse ® blocks, the starter solenoid, and the alternator; these are the tree red battery cables you see on the positive terminal of the battery cable. If you have a bad alternator diode, that will cause battery drain (I once knew someone who had this problem on a sailboat) but that should throw a code on a Cadillac.

The RH Maxifuse Block has these fuses on it:

  • BATT 3 (30 Amp)
  • Batt 2 (30 Amp)
  • IGN 1 (40 Amp)
  • BATT 1 (50 Amp)
  • Brakes (50 Amp)
  • Cool Fans (50 Amp)

The LH maxifuse block has these fuses on it:

  • Body 1 (60 Amp)
  • Body 2 (60 Amp)
  • Bode 3 (50 Amp)
  • Indvert (50 Amp)
  • Lamps (60 Amp)
  • Ign 1 (50 Amp)
  • Windows circuit breaker (30 Amp)
  • Seat circuit breaker (30 Amp)

The simplest thing to do is to leave the car with the hood up and the key off, with the fuse cover off (the big one that exposes the Maxifuse blocks, not the little one that shows about 10 fuses) and pop each of them in turn. If a 12 Volt test light shows that one of these is drawing power after about ten minutes, then something is amiss on that circuit.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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...