Gauge lights always on

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whiskee

Junior Member
Joined
Nov 10, 2022
Posts
1
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Location
Navarre, Florida
First Name
wes
Truck Year
1979
Truck Model
k15
Engine Size
350
I’ve been working on rebuilding my 1979 K15. The cluster gauge lights are always on. Pull the INST LMP fuse and there’s a constant 12v to it. The headlight switch is new, problem still exists. I did a continuity check on both sides and they all check.
-gray wire to gauge lights, wiper, heater and radio check good
-green wire to headlight switch is good

everything else works fine. Pull the fuse and the lights are off.
 

MarineOne

Full Access Member
Joined
Jan 12, 2023
Posts
440
Reaction score
451
Location
Western New York
First Name
David
Truck Year
1986
Truck Model
K25
Engine Size
454
Headlight switch is likely bad. It's pretty common because all the power for headlights feed through it vs triggering a relay.
 

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