How to help service customers inspect vehicle lighting


The COVID-19 coronavirus pandemic has caused the Commercial Vehicle Safety Alliance (CVSA) to postpone its annual International Roadcheck inspection blitz, originally slated for May 5-7, 2020. New dates for its enforcement campaign have not yet been decided but at some point, the CVSA will reschedule.

Whether a truck is in for a repair or PM, service providers can help ensure their customers’ drivers don’t receive citations or have their trucks pulled out of service for myriad reasons. One such way to help is by inspecting vehicle lighting.

As LED, or light-emitting diode, lights have become so much more prevalent over the years, in several instances it’s easier to tell when lights are beginning to fail completely.

Technician installing an LED light from Optronics International the the back of a trailer

Technician installs an LED light from Optronics International.

Yet, infractions because of improper “lighting devices,” which the Federal Motor Carrier Safety Regulations define as headlamps, tail lamps, stop lamps, turn signals, clearance and identification lamps, side marker lamps, license plate lamps, reverse lamps and lamps/flags on projecting loads, represent a sizable percentage of vehicles found in violation and potentially being placed out of service. During the CVSA’s International Roadcheck, held June 4-6, 2019, there were 16,347 out-of-service vehicle conditions in the United States and Canada. Lighting devices ranked fifth with 1,875 violations (11.5 percent).

“Most LED lights that make up a turn signal, brake light, etc., go out in clusters. There might be a multitude of LEDs that are still operating within that specific light but there’s maybe three or four LEDs that are inoperable; that doesn’t necessarily mean the light is in violation,” says Kerri Wirachowsky, CVSA roadside inspection program director. “If the light can still be seen from the required distance for that light with the LED lights that are remaining, the light is not yet in violation.”

Wirachowsky, who served as a roadside inspector for more than 25 years, says if technicians and drivers notice the few inoperable diodes, they can do pre-emptive maintenance and replace them before a violation ever exists.

Truck trailers with LEDs from Peterson Manufacturing

Peterson Manufacturing suggests performing a complete inspection of the lighting and harness connections.

“If you don’t repair what’s not working when it is noticed, eventually the next cluster is going to go out and [officials are] going to then cite a violation,” she says. “My point is it gives you a timeframe to fix the problem before it’s a violation. Don’t wait until everything goes out and it is a violation and/or out of service. That’s too late and just a bad maintenance practice.”

What service providers can do

Several lighting manufacturers offer tips for aftermarket service providers to ensure their customers’ truck and trailer lights are in good condition.

Mark Assenmacher, director of marketing, Peterson Manufacturing, suggests performing a complete inspection of the lighting and harness connections.

Major causes of light failures can include damage, corrosion, loose connections, poor grounding and excessive shock and vibration in the case of incandescent lamps, Assenmacher says. Some of these causes can be minimized by using LED lighting, which is much less susceptible to shock and vibration.

“Using good weather-resistant connectors such as AMP-compatible or other hard-shell connectors can help keep out corrosion at the connection point. Industry-standard type plugs, such as PL3 or P10, should be inspected regularly and dielectric grease should be used to protect the connection point,” he says.

Truck trailer with Grote LED stop-tail-turn lights

Grote Industries says when technicians are inspecting LED lights, they should be looking for cracked lenses, which can be caused, for example, by a forklift, a branch or a dock pad.

Assenmacher cautions, “If at all possible, test probes should not be used, especially on a trailer with a complete sealed harness and lighting system, as this may void any OEM warranty. Some lighting and harness manufacturers offer guides or maintenance posters to assist repair facilities with trouble-shooting.”

Mark Blackford, director, national fleet sales, Grote Industries, says when technicians are inspecting LED lights, they should be looking for cracked lenses, which can be caused, for example, by a forklift, a branch or a dock pad.

“Cracks will draw moisture into the housing. If you have a cracked lens, it’s amazing how much water will penetrate that lens and get into the light itself,” Blackford says.

He suggests visually inspecting the harness pigtails as well as the power cord between the tractor and the trailer. “If you’re not getting proper voltage to the trailer, you’re never going to have proper functioning LEDs.”

Blackford offers another pointer: if there are four taillights and one is burning dimmer than the rest, there’s probably an issue with the ground. Corroded terminals at the ground will sap the needed amps for a LED to light properly, he says.

Popular modular power delivery systems have snap-together connectors enabling OEMs to design electrical system configurations that supply electricity on a vehicle. However, if these systems are not maintained properly, they become susceptible to the elements and ultimately to failure, says Kyle O’Dell, director of engineering, Optronics International.

“Electrical connection points are the weakest link in the chain and each presents an opportunity for moisture to invade the system and cause corrosion,” O’Dell says. “Some fleets are proactive and work with their … maintenance folks to apply heat-shrink moisture barriers to all electrical connections as soon as they take delivery of new vehicles.”

O’Dell says technicians inspecting LED lights should ensure all lighting is correctly installed and operating properly. Cables and wiring might have been bent during installation or through subsequent stress — both can cause cracks in its protective insulating layers.

Technicians should examine seals, connection points and cable and assess wiring integrity, because “a vehicle’s movement can adversely impact lighting and harness systems,” he says.

O’Dell says to inspect connectors regularly and apply dielectric grease as needed.

He adds, “Lighting and harness PM is like regular exercise. First you have to make it a routine and, once you start doing it regularly, the benefits are significant, noticeable and wide-ranging.”

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