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03-18-2021, 02:13 PM | #1 |
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another Headlight question...FIXED
I have a 2000 (GMT400 body) C2500. I am having issues with the healights. Specifically the low beams. I have DRL's (working) and high beams, NO LOW BEAMS. I have changed the multi function switch(turn signals switch) the brake light switch, and the headlight switch, still no low beam lights. I have removed the #15 fuse, still no low beams. New bulbs too. Now because the DRL's are working, that tells me that it's not a wiring issue because they are on with DRLs. High beams work just fine. What am I missing?
Thank You Lance
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------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT Last edited by manimal; 03-31-2021 at 08:15 PM. |
03-18-2021, 02:47 PM | #2 |
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Re: another Headlight question
Have you checked the relay in the fuse box under the hood?
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Mike |
03-18-2021, 11:38 PM | #3 |
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Re: another Headlight question
Relay? I know of the maxi fuse. Unless my power distribution box lid has been changed.
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------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT |
03-19-2021, 09:11 AM | #4 |
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Re: another Headlight question
On the 2000 1500, there is a headlamp relay in the underhod fuse box. Being that you have a 2500, I'm not sure which fuse box they used, so there might be one in the underhood fuse box. If it's the older fuse box like the 88-98, then it won't have one and all the voltage runs through the switch and the breaker in the inside fuse panel.
So if you have the old fuse box, check the breaker in the panel on the drivers side of the dash
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03-21-2021, 11:59 PM | #5 |
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Re: another Headlight question
changed the relay under the dash by the e-brake pedal, still no low beams.
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------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT |
03-22-2021, 12:19 AM | #6 | |
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Re: another Headlight question
Do the high beams turn off when the low beams are selected? Have you checked for power out of the switch for the low beam signal?
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03-23-2021, 02:50 PM | #7 |
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Re: another Headlight question
Yes, the highs go off when I switch to lows. have not checked signal from switch on lows. I did just replace the switch, the multi function switch and the brake light switch and bulbs.
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------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT |
03-29-2021, 11:46 AM | #8 |
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Re: another Headlight question
Ok, so this weekend I tested the pins for the relay. Pin 86 (ground) is bad. Not grounding. I have tested a known good power source then grounded the pin and nothing. I have seen a few different wiring diagrams, but not sure which one is correct. WHERE is the DRL module? or IS there one? I found the diode, but is there a module?
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------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT |
03-29-2021, 12:42 PM | #9 | |
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Re: another Headlight question
Mine is in my glove box. It's under the dashboard to the left of the ash tray.
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03-29-2021, 08:32 PM | #10 | |
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Re: another Headlight question
This is the module. My headlights work normal without it. Never tried putting it in, it was like that when I got it.
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03-29-2021, 10:08 PM | #11 |
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Re: another Headlight question
Thats the diode right? Mine is fine. My concern is pin 86 at the convenience center for the drl.relay is not grounding.
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------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT |
03-29-2021, 10:28 PM | #12 | |
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Re: another Headlight question
Whatever it is, it isn't necessary for the headlights to work with the switch.
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03-30-2021, 01:25 PM | #13 |
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Re: another Headlight question
I've ripped that stupid th im ng lout of every 95 up obs me and my friend had. Hate drls.
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03-31-2021, 08:18 PM | #14 |
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Re: another Headlight question
I kinda feel stupid. I replaced the relay with a new one from the parts store, same as the one I took out. Well it turned out it was the wrong relay to begin with. I pulled the relay from my 99 Suburban and.....Headlights now WORK. Difference? the one I pulled and replaced in the truck was a 4 blade relay, the one from the Suburban is a '5' blade.
So, Thank you to all that helped me. Lance
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------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT |
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