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roybelding
roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
Satisfied Customers: 5729
Experience:  Shop Froeman for Freightliner Trucks
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I have a 2003 Freightliner Columbia. Having issues with my

Customer Question

Good morning . I have a 2003 Freightliner Columbia . Having issues with my marker lights not working when my headlights are on . I have replaced my dash switch already no change . Checked fuses and relays everything looks good . When my marker lights are on my left rear blinker will not work . When I test the plug I'm getting signal but light will not blink .
Submitted: 10 months ago.
Category: Medium and Heavy Trucks
Expert:  roybelding replied 10 months ago.

good morning my name is ***** ***** I will assist

it sounds like you have a wiring harness issue somewhere. if you remove the left rear light, will the markers work with the headlights.

Roy

Expert:  roybelding replied 10 months ago.

I see you viewed my answer, are we going to continue???

Roy

Customer: replied 10 months ago.
Removed light still nothing . Replace 3 marker lift relays same ... No marker lights . Is there any way to jump them ? I'm on the road . Gonna need to do some night time driving to make my app. On time
Expert:  roybelding replied 10 months ago.

you have a harness issue as I stated before. you are going to need to examine the harness especially at the rear for any damage or shorts. without me being there, it is impossible for me to pin point the exact failure.

most of the harness failures revolve around the rear of the truck

Roy

Expert:  roybelding replied 10 months ago.

please dont forget to rate me as it is the only way I get paid for my efforts

Roy

Customer: replied 10 months ago.
Chased the rear Harness looked for broken wires and still no luck . I was told about a black box filter . Any idea where I can find that box on my truck ?
Customer: replied 10 months ago.
Also checked the interrupt switch cleaned contacts . Still same issue . Any idea if this system runs on two grounds ?
Expert:  roybelding replied 10 months ago.

common grounds at rear of the truck.

black box filter???

Roy

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