Question about 1999 Cadillac DeVille

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Location of ground wires

Car starts hard and headlights dont turn on at night and have a skip when you take off i believe its a ground wire somewere all in all its a solid running car and it has to be something simple but we all know we want to avoid garages

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Posted on Jan 02, 2017

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SOURCE: i have a car that i have to hot wire to start it

change the ignition switch

Posted on Jun 07, 2009

  • 285 Answers

SOURCE: car dont wana start after i changed the wire harnest

which wiring harness??? u might have to reset the theft system by taking it to a shop or dealer.

Posted on Sep 05, 2009

  • 1975 Answers

SOURCE: i need the color codes for a 1993 Cadillac Seville

This should cover it but there are several different plug types so was unable to give you the right one for that and also what type of factory radio made a difference as far as the plug was concerned but the wire colors should be correct.

Constant 12V+ = Orange

Switched 12V+ = Yellow

Illumination = Gray

Ground = Black

Dimmer = Brown

Antenna Trigger = Pink

Left Front (+) = Tan

Left Front (-) = Gray

Right Front (+) = Light Green

Right Front (-) = Dark Green

Left Rear (+) = Brown

Left Rear (-) = Yellow

Right Rear (+) = Dark Blue

Right Rear (-) = Light Blue

Posted on Nov 05, 2011

  • 76846 Answers

SOURCE: 1988 Cadillac DeVille lights flickr while driving when the car is cold with new alternator

Check the connectors and the head light ground straps near the headlights

Posted on Nov 02, 2012

  • 14 Answers

SOURCE: i have a 98 catera 3.0 motor had to change

The ECM probably needs to be flashed because it contains the VIN number and all the info on the engine. Good luck, I cannot find anyone that is able to flash mine, they say it's too old and no longer supported by ACDelco.

Posted on Jun 24, 2013

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hmmmm sounds like you are on the right track with the ground . with as much current as headlights pull it is possible that the intermittent open you are experiencing has to do with heat coming from an open in the wiring . i believe your best bet would be to locate a wiring diagram for your cars headlight circuit and inspect every wire in that circuit as well as one surrounding for thing like : burn marks , corrosion , places where insulation has worn off or is no longer even there ( :) ) ,and i believe you may find something . also , some cars come with a set of relays specifically for the headlights . these the headlights may be drawing extra current through the relay causing it to switch off (means headlights are bad ) , or the relay itself may have worn out over time (relay (s) may be bad ). i hope this helps you

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