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Kevin Bourcier
Kevin Bourcier,
Category: GMC
Satisfied Customers: 118
Experience:  Owner/Technician at Max Air Mobile
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I have a 1983 GMC k 2500 and the low beams will not light up

Customer Question

i have a 1983 GMC k 2500 and the low beams will not light up unless you have the high beams on
JA: Have you checked the bulbs? Have you checked the fuses?
Customer: yes bulbs is there separate fuses for low beam headlights on that truck
JA: What is the model of your '83 GMC?
Customer: k 2500
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: yes I have installed a new high beam that was out and checked some wires
JA: Anything else you think the mechanic should know?
Customer: yes i have replaced the switch that switches from low beam to high beam and like i say when switched to high beam the low beams light same as high beam but switch back to low beam no lights at all
Submitted: 1 year ago.
Category: GMC
Expert:  Kevin Bourcier replied 1 year ago.

is this the type of headlight configuration your truck has ?

Customer: replied 1 year ago.
except the high beam i believe is on top low on bottom , maybe i can explain better the bulb on top has 3 prongs and the bulbs on the bottom have 2 prongs , hope that helpsSherman
Customer: replied 1 year ago.
that is the configuration yes
Expert:  Kevin Bourcier replied 1 year ago.

on the left side 3 prong headlight you should have power on the tan colored wire when the headlights are on and switched to low beam . if not the first thing to do is to check for low beam coming out of the dimmer switch . does your truck have a floor mounted dimmer or column nounted dimmer ?

Customer: replied 1 year ago.
floor mounted and i replaced it with a new one and it still does the same thing exactly
Customer: replied 1 year ago.
i will check for the power on the tan wire as you say
Expert:  Kevin Bourcier replied 1 year ago.

the floor mount dimmer switches are known for getting corroded in the connector due to moisture on the floor mat / carpet . check the connections there . we were continuously replacing dimmer switch plugs .