Headlight Issue
Record Breaker
Joined: Sep 2015
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Pin 6 is red
Pin 1 is red/orange stripe
Pin 10 is violet/white stripe
While you're at it, you might also try pin 5 (brown/light green stripe) to pin 1. Also pin 5 to pin 10. The lights will only come on with the ignition on, this way we can test circuit too.
Pin 1 is red/orange stripe
Pin 10 is violet/white stripe
While you're at it, you might also try pin 5 (brown/light green stripe) to pin 1. Also pin 5 to pin 10. The lights will only come on with the ignition on, this way we can test circuit too.
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Veteran
Joined: May 2007
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Okay, busy weekend but I will try to sneak in here to help...
Below is a pic of your wiring. Try a jumper in the connector that goes to the DRL module, not the module itself. Try one between pin 6 (constant B+, should not need the truck on) and pin 1, you should get high beams. After that, try a jumper between pin 6 and pin 10, you should low beams. The position of the headlight switch and stalk switch should not matter. Basically, you are just running a B+ straight to the headlights, one step at a time. Check the headlights, when checking highs, you will not get the high beam indicator. Let us know...
Below is a pic of your wiring. Try a jumper in the connector that goes to the DRL module, not the module itself. Try one between pin 6 (constant B+, should not need the truck on) and pin 1, you should get high beams. After that, try a jumper between pin 6 and pin 10, you should low beams. The position of the headlight switch and stalk switch should not matter. Basically, you are just running a B+ straight to the headlights, one step at a time. Check the headlights, when checking highs, you will not get the high beam indicator. Let us know...
Jumping pin 6 with pin 10 turns on low beams.
Now where do we go from here?!?!
Did we confirm if my new switch is defective or not? Did we confirm that my DRL module is bad?
Record Breaker
Joined: Sep 2015
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Can you drive around a few days with the jumper from pin 5 to pin10 (low beams) to see if they stay on all of the time, no blinky-blinky?
Sound to me like at the least the DRL module is goners. The light switch is a possibility but I am not committing to that yet.
Sound to me like at the least the DRL module is goners. The light switch is a possibility but I am not committing to that yet.
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Yep, for sure. I'll give that a try. Thanks again
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Miraculously, I had the correct size of individual male pins among my electrical stash to fabricate an OEM-looking jumper wire that "plugs" right into the female harness for pins 5 to 10, complete with soldered ends and heat shrink! If my lights don't flash, I'm willing to call this a permanent fix as this just uses my low beams as my DRL's. The only thing I don't have with this set-up is the "high beam indicator light" on my dash when I use the stalk to click on the brights. But that's something I can live without. Will keep you posted...
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Update!
My high beams have quit working. I see no specific fuse for just the high beams, so where do I start troubleshooting? There are relays on the LMC harness, should I be replacing those, or is there a way to test them? Or is it to do with my DRL module which I already know has been faulty for years?
edit: I figured out the problem. One of the LMC relays is faulty.
My high beams have quit working. I see no specific fuse for just the high beams, so where do I start troubleshooting? There are relays on the LMC harness, should I be replacing those, or is there a way to test them? Or is it to do with my DRL module which I already know has been faulty for years?
edit: I figured out the problem. One of the LMC relays is faulty.
Last edited by atc250r; Nov 4, 2017 at 04:14 PM.
