high beam light on when headlights off


Joined
Nov 3, 2023
Messages
103
Points
101
City
CGY
State - Country
AB - CAN
Vehicle Year
1991
Drive
4WD
Engine
4.0 V6
Transmission
Manual
Total Lift
1.5” level
Tire Size
31X10.5R15
My credo
i think i have some truck on my rust
anyone have this happen? intermittent issue, my high beam indicator light (and possibly my high beams, maybe just headlights/ low beams) will sometimes turn on without any input, when the headlights are off, just using drls. its not even when i hit a pothole or something, seriously just whenever it feels like it. could it be the multifunction switch, or is there a relay I've got that's sticking? i cant find a relay location for the hi beams or lows. TIA (1991 ranger xlt supercab)
 
Definitely an electrical gremlin
 
Definitely demonic possession. Try putting holy water in your windshield washer.

This was a new one on me.

Looking at the '91 EVTM, it looks like it would have to be something breaking down in the Daytime Running Lights module itself, as the high-beam indicator light is fed directly from it.

DRL module is on the "LH side of the radiator support". Here are the schematics for the DRL system:

high beam light on when headlights off


high beam light on when headlights off


high beam light on when headlights off
 
Definitely demonic possession. Try putting holy water in your windshield washer.

This was a new one on me.

Looking at the '91 EVTM, it looks like it would have to be something breaking down in the Daytime Running Lights module itself, as the high-beam indicator light is fed directly from it.

DRL module is on the "LH side of the radiator support". Here are the schematics for the DRL system:

View attachment 144346

View attachment 144347

View attachment 144348
thanks so much for the diagram!! ill try and rip a drl module from a yard and see what that does for me.
 

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