Ripper Posted August 20, 2010 Share Posted August 20, 2010 I have tried everything but the headlights dont shut off. I have to remove the fuse or the relay to get them to go out. I have unplugged the headlight switch the multifunction switch the headlights wont go out. I was told by my local Mack dealer this truck would not have daytime driving lights. Help please.. Quote Link to comment Share on other sites More sharing options...
rhasler Posted August 20, 2010 Share Posted August 20, 2010 I have tried everything but the headlights dont shut off. I have to remove the fuse or the relay to get them to go out. I have unplugged the headlight switch the multifunction switch the headlights wont go out. I was told by my local Mack dealer this truck would not have daytime driving lights. Help please..There have been problems with the headlight switches failing prematurely due to current spikes. I have also seen this sort of problem when the wrong headlamp switch has been installed. The switches for the different chassis that Mack manufactures often use switches that are similar in appearance but that have different pin locations. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment Share on other sites More sharing options...
fjh Posted August 20, 2010 Share Posted August 20, 2010 There have been problems with the headlight switches failing prematurely due to current spikes. I have also seen this sort of problem when the wrong headlamp switch has been installed. The switches for the different chassis that Mack manufactures often use switches that are similar in appearance but that have different pin locations.Have you changed any headlights lately??? be sure you have the right headlight bulb installed, there are 2 diffrent numbers 9007 I beleive is the correct one for your truck!But check with the dealer for the proper number!If you put the wrong light in one side it will cause this. Quote Link to comment Share on other sites More sharing options...
Ripper Posted August 21, 2010 Author Share Posted August 21, 2010 (edited) There have been problems with the headlight switches failing prematurely due to current spikes. I have also seen this sort of problem when the wrong headlamp switch has been installed. The switches for the different chassis that Mack manufactures often use switches that are similar in appearance but that have different pin locations.I actually have the switch unplugged and the lights are still on, we got this at the auction this way. I am trying to get it going. You know though the switch dont have the factory plug in the back of the switch. Someone replaced it with female spade connctors. Do you know if the switch has to be in the circuit and working properly to complete the circuit so the lights will shut off? Edited August 21, 2010 by Ripper Quote Link to comment Share on other sites More sharing options...
Ripper Posted August 21, 2010 Author Share Posted August 21, 2010 Have you changed any headlights lately??? be sure you have the right headlight bulb installed, there are 2 diffrent numbers 9007 I beleive is the correct one for your truck!But check with the dealer for the proper number!If you put the wrong light in one side it will cause this.Thanks for the help I will look tommorow we bought this at the auction like this but I didnt think of looking at the light bulbs to see if they are the same I know both are burning only it is like there is a day time running light for they dont dim or brighten they just stay on all the time. Quote Link to comment Share on other sites More sharing options...
shortstack Posted August 21, 2010 Share Posted August 21, 2010 Thanks for the help I will look tommorow we bought this at the auction like this but I didnt think of looking at the light bulbs to see if they are the same I know both are burning only it is like there is a day time running light for they dont dim or brighten they just stay on all the time.Just an idea, have you tried replacing the relay with a known good one? I'm wondering if the relay could be stuck. Quote Link to comment Share on other sites More sharing options...
Ripper Posted August 21, 2010 Author Share Posted August 21, 2010 Just an idea, have you tried replacing the relay with a known good one? I'm wondering if the relay could be stuck.Yes, I bought 3 new ones for the old ones was missing when the truck was boughten. I then thought maybe just by luck I got some bad ones so I bought three more from Napa and the same thing was going on. I am at my wits end on this one. I thought maybe mice or something got in and chewed up the wiring so I got the dash wiring undone and checked to make shure the fur biting criters didnt do any damage. Quote Link to comment Share on other sites More sharing options...
cgallamore Posted August 22, 2010 Share Posted August 22, 2010 hope the wires arent melted together Quote http://www.bigmacktrucks.com/uploads/1272400769/gallery_4852_794_314995.jpg Link to comment Share on other sites More sharing options...
Ripper Posted August 22, 2010 Author Share Posted August 22, 2010 hope the wires arent melted togetherThat is what is weird I have not yet found anthing melted together Quote Link to comment Share on other sites More sharing options...
RowdyRebel Posted August 23, 2010 Share Posted August 23, 2010 Have you changed any headlights lately??? be sure you have the right headlight bulb installed, there are 2 diffrent numbers 9007 I beleive is the correct one for your truck!But check with the dealer for the proper number!If you put the wrong light in one side it will cause this.You sure? I thought the CH used the 9004... Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment Share on other sites More sharing options...
drg Posted August 23, 2010 Share Posted August 23, 2010 Had the same problem on 2003 cx and a 1999 ch both of them were fixed by pulling the relay for the daytime running lights. Hope this helps. Quote Link to comment Share on other sites More sharing options...
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