high beams not working

Seneca2e · Apr 14, 2017

joecitizen said: ↑

finally got to the truck today and sure enough, turn the key on and voila...high beams, even the indicator light on the dash is working!

still got a clicking sound coming from the relay for the trailer...

thanks again to all who offered input...
Click to expand...

This might be a old thread but boy is it a valuable one! Which I'd read it quicker and I'd saved about 2 hours of chasing relays, dimmer switches, and wiring!

Catdirtman · Oct 18, 2017

BigSam said: ↑

The manual can be downloaded for free on freightliners web site. I PM'ed you a link to the manual.
Click to expand...

Is there any way you could send me that link?? Thanks

Bobbyediane · May 7, 2018

BigSam said: ↑

Per the Freightliner FLD120 manual:

Headlight Switch and Daytime
Running Lights
A three-position headlight switch (Fig. 2.8) is used to
operate the exterior lights. When the switch is up the
headlights, and all other vehicle lights, are on. All
vehicle lighting is off when the switch is in the middle
position. When down, the switch activates only the
clearance, instrument panel, and marker lights, and
the taillights. The switch for the headlight high beams
is built into the turn signal lever. When the headlights
are on high beam, a green light in the warning and
indicator light module goes on. The ignition switch
must be on for the high beams to operate.
For vehicles built to operate in Canada, switching on
the ignition and releasing the parking brakes automatically
activates the headlight low beams (later
model vehicles) or high beams (earlier model vehicles)
at half voltage as daytime running lights. The
daytime running lights will operate until the parking
brakes are applied; then they will switch off. Turning
on the regular headlights will override the daytime
running lights. The vehicle cannot be driven unless
either the headlights or daytime running lights are
activated.
Click to expand...

Thank you so much. My daddy has had this truck for years and many more before it and apparently never knew that. You just saved an all over over haul of the electrical system and I am so very grateful.
Diane Weatherford
Texas

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