Hi,
Which warning lights come on? Also, the heading indicates no radio, headlamps, interior lights. In the post they turn on when you hold the flash to pass switch for high beam. Is that correct?
If that is, I suspect either a ground issue or the body control module is failing. I attached three pics below. The first shows fuses I need you to check. The second shows a TBC (truck body computer). Check that fuse. The third fuse shows the grounding relay. Note the grounding relay has a splice in it. I circled it as well as the grounding location. Check both
The reason I'm questioning a ground or BCM (body control module AKA truck body control) is simply because the radio and warning lights shouldn't be associated with the headlights. So, in theory, the body control module is bad or we have a short within the ground allowing power to flow where it shouldn't.
Let me know what you find.
Joe
Images (Click to make bigger)
SPONSORED LINKS
Thursday, April 23rd, 2020 AT 5:06 PM