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Alternator wiring diagram - batter not charging?

Tiny
ALLEN TALLMAN
  • MEMBER
  • 1 POST
  • 1999 CADILLAC DEVILLE
  • V8
  • AUTOMATIC
  • 104,000 MILES
Car died a couple blocks from home. I let it set a few minutes it started back up, I made it home and it died again. The charging system failure lite on dash. The battery seemed dead so replaced with new one and now it will turn over but will not start. I have checked for spark it is good. My guess is alternator or voltage regulator. Is there anything else that I can check?
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try resetting security system see link. Because battery was removed also get charging system checked auto parts can do that.
.https://www.2carpros.com/articles/how-to-reset-a-security-system
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
NATE209
  • MEMBER
  • 1 POST
  • 1999 CADILLAC DEVILLE
Electrical problem
1999 Cadillac Deville V8 Front Wheel Drive Automatic

99 deville alternator wire melted and was hanging from alternator.I got a new harness(pigtail) but I cant for the life of me find where it goes from the alt. There is no sign of the other end. Where do I find it or where do I run the two new wires?Any help is appreciated!
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
If the wire is for field control, it probably runs to the engine control module. How much of the wire is melted, can the end just be spliced on? Do you know why it melted?
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
CHRISTINEFREDERICK
  • MEMBER
  • 4 POSTS
  • 1999 CADILLAC DEVILLE
After changing batteries twice, making sure fully charged and replaced alternator, Im still having trouble wioth it going dead overnight. Usually when u get it jumped and started and use it its ok but park it for a length of time and it goes dead. Now what?
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Check to see if there is an electrical draw when everything is off. There are directions on our homepage under the DIY section. Let me know what you find.
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
DIVAMONROE
  • MEMBER
  • 1 POST
  • 1999 CADILLAC DEVILLE
Electrical problem
1999 Cadillac Deville V8 133000 miles

I have replaced my alternator 3 times, now the mech. Said it was the wiring harness that was draining the alternator and the battery, I just paid $645.00 total for parts and labor. Is this about right for repairs or was I taken by the mech? Please help single female.
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi:
I can't imagian that the alt would cost more than 200 dollars and 100 for the battery. I believe to R&R the alt takes about 1 hour.
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
KEVIN SMITH
  • MEMBER
  • 1 POST
  • 1998 CADILLAC DEVILLE
Electrical problem
1998 Cadillac Deville V8 Front Wheel Drive Automatic

How do you change an alternator for a 1998
cadillac deville?
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Disconnect the battery, remove the serp belt, remove the bolts mounting the alt, remove the wiring from the alt, and remove the alt. Reverse the sequence to replace it.
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
WINKYLOCC
  • MEMBER
  • 1 POST
  • 1998 CADILLAC DEVILLE
  • V8
  • 2WD
  • AUTOMATIC
  • 128,000 MILES
I noticed the hot copper wire that goes to my generator has rubbed up against something and caused it to wear down to all but a few threads of wire. To replace the entire harness is a lot more involved I think than trying to repair or rebuild the wire that is left. Do you have any ideas on how to do this?
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
ROB2008
  • MECHANIC
  • 258 POSTS
Well you could cut the wire, strip it and then twist the too copper ends together. After that wrap it in electrical tape. This would probably be the easies way to fix it.

-Rob
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
AUNDRA
  • MEMBER
  • 1 POST
  • 1997 CADILLAC DEVILLE
Electrical problem
1997 Cadillac Deville V12 Front Wheel Drive Automatic

could have I wired the two wires wrong?
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Need more info on concern, and attempted repairs.
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
REARDRIVE
  • MEMBER
  • 93 POSTS
  • 1992 CADILLAC DEVILLE
  • 4.9L
  • V8
  • FWD
  • AUTOMATIC
I bought a new alternator and a new alternator plug with three wires But the old plug came off the car have only one wire hookup I hook car wire to letter L On of the new wire together and tape it I start the car about ten minutes warning lights start coming on motor start running rough I check the volt before it start running bad it read 11/77 volts I turn the car off the battery built up to 12/32 volts Do I need to put back the same one wire plug
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
There's a place for four wires in that plug so it can be used in numerous different applications. When the original plug used only one wire, you use the same wire in the same location in the new plug and you just don't use the other wires. They can be cut off.

When you connect wires, the only acceptable method is to solder the splice, then seal it with heat-shrink tubing with hot melt glue inside. Never use electrical tape in a car. It will unravel into a gooey mess on a hot day.

Also be aware that due to their design, these generators have a very high failure rate. To reduce the number of repeat failures, you must replace the battery at the same time unless it is less than about two years old.
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
LPICHARDO
  • MEMBER
  • 1 POST
  • 1994 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 216 MILES
My 1994 cadillac sedan deville 4.9 v8 sends me a message saying battery volts high? I changed the alternator but it still appears?
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
What is the alternator out put reading?

Mhpautos
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
U need to check the charging sys. Did u clear the codes? The code maybe is still their as a history code not a current code good luck
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Tuesday, February 12th, 2019 AT 2:03 PM (Merged)

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