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Hey all so i have a 05 Cadillac Escalade ESV and up until the past 3 weeks its been working great, i woke up one morning to goto work and the battery was 100% dead, figured its -30 around here and maybe thats the issue, so boosted it drove it to work came out on lunch and the DRL which are converted to LEDs were on, i thought thats pretty odd, so after work drove home its like 5:30ish so was dark out here, and turned the truck off and the interior lights stayed on, so i tried all switches and could not get them off so started the truck then turned it off everything seemed good, so i go in the house eat dinner look out the window and the headlights are on, go out to the truck try manually turning them off and they wont shut off so disconnected the NEG- on the battery and said F it for the night but for the past 3 weeks i have been disconnecting the NEG and reconnecting it everywhere i go (pain in the ___) anyways thought it would leave it yesterday to see if maybe it randomly fixed itself but well im here cause thats not the case, at one point the headlights where going on and off and on and off all on there own, but during the day its just the DRL so i guess im trying to figure out what could be the issue and where i would start to getting this resolved once and for all, thanks all in advanced for your help
First reply: The closest year factory shop manual that I have is the 1997. Others with more knowledge of the 1992 Eldorado will chip in. From the 1997 FSM, the 10 Amp MIRROR fuse provides the voltage for the signal for the dimmer switch. But I see four fuses for the headlights, one for each beam on each side, each 10 Amps. There is also a master 20 Amp HDLPS fuse that is probably the one you mention. There is a master headlamp relay and a high/low beam realy. Second reply: If my 1997 schematic for this circuit applies to your 1992 model, it's the high-low beam relay. My FSM says it's in the underhood fuse/relay area. If no one with a 1992 FSM steps up, I will look and see where it is in the 1997 models and upload that. There is a second relay. This second relay switches the power from low beam to high beam. If its contacts are worn out on the low beam side, that would cause your problem. A relay is a $5 throwaway part. I was looking for the relay on RockAuto and found that it seems to be part of the headlamp switch assembly. This contradicts my 1997 FSM which says the relay is in the underhood fuse/relay center. It would seem that you may be able to solve your problem with a new headlamp switch assembly. There are different configurations depending on whether you have fog lights, etc. Third reply: If you are comfortable with a volt/ohmmeter you can check the switch before you take it apart, or even take it out of the car. I strongly suggest doing that because we don't have a firm diagnosis. We haven't looked at the OBD codes yet, for example. The dimmer switch could be the problem too. If you do need the switch assembly and will consider a new part, the part is a Standard Motor Products DS731. Whoops, I see that Rock Auto wants $235.79 for it. BUT Amazon wants $129.00 plus $2.50 shipping: http://www.amazon.com/Standard-Motor-Products-DS731-Headlight/dp/B000C7XVOI If someone with a 1992 FSM or who is familiar with the 1992 Eldorado headlight wiring would step in, that would be helpful too.