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I have A 2020 Mack GU813 with no low beam or marker lights…

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I have A 2020 Mack...
I have A 2020 Mack GU813 with no low beam or marker lights on front hood assy only. High-beams do work. Ran DID check on ll lights. No faults identified. Side marker, over cab markers and rear lights all work properly.
Submitted: 10 months ago.Category: Medium and Heavy Trucks
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Answered in 2 minutes by:
2/1/2022
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 10 months ago
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,780
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
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Customer reply replied 10 months ago
Ok
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 10 months ago

On your issue, your will want to scan around the harness where it mounts on the hood and goes to the chassis in each side and look for any defects. We have had many issues with rubbed or shorted wires. The lamps are computer controlled on this model year and if the module detects a open or short circuit it will kick that circuit off.

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Customer reply replied 10 months ago
Would the DID then not check this off as working properly? I'm assuming where these R/L wires junction together or at firewall connector
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 10 months ago

The DID checks inputs and outputs so if it senses the presence of one lamp it will pass that functionality. There are 2 connection points outside of the cab. One at the MCFC connector which is the main cab connector and the other is the FCHL which is the connector on each side of the hood for the lamps.

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Mike Mcmillan
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
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Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel

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