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Old 04-20-2016, 04:09 PM   #1
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Question Marker or Clearance Lights

How do you use them if at all? Why are they on a class A. I use a GPS that steers me clear of short overhangs...but I have come close while driving through the south. Is there another use for these lights. I have a switch that will blink them.
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Old 04-20-2016, 04:22 PM   #2
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Quote:
Originally Posted by Voyager35L View Post
How do you use them if at all? Why are they on a class A. I use a GPS that steers me clear of short overhangs...but I have come close while driving through the south. Is there another use for these lights. I have a switch that will blink them.
The lights are required to meet NHTSA requirements for large vehicles:
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Old 04-20-2016, 04:42 PM   #3
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A lot of us will blink the lights if we are being passed at night by a truck/rv to let them know they have cleared us and they can return to the lane You should also have a switch that will blink your headlights and that is used more often for the same thing. It can also be as a way of saying Thanks when someone flashes it's okay for you to return to the lane after passing. It's more of a courtesy thing.
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Old 04-20-2016, 11:59 PM   #4
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The marker and clearance lights are not there so you can see some low overhang or something, they are there so other people or vehicles can identify and make out the size and shape of your vehicle. Marker/clearance lights are controlled by your headlight switch, and go on or off with your headlights/running lights.

The Amber (or red) lights on the side/front/rear of the coach in the area about 2 - 6 ft off the ground are marker lights, and their specific position will inform those who know just how big your vehicle is, whether it's articulated, etc. The Amber/red lights near your roofline are clearance lights, and they tell others how high you are. The light patterns front and rear (1-3-1 for most vehicles) are stipulated by federal regs.

The momentary switch you're talking about used to be referred to as the ICC flash, named for the Interstate Commerce Commission, the federal agency that until 1996 was charged with the regulation of- you guessed it-- interstate commerce.... Well, any surface transportation involved in interstate commerce. Basically trucks, buses, and trains. That switch simultaneously flashes your running lights, marker lights, and clearance lights-- and in many cases, your headlights, too.


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Old 04-21-2016, 08:59 AM   #5
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My ICC switch is just an On/Off toggle and not a momentary toggle. Shouldn't it be on a momentary toggle switch so as not to accidentally leave the marker and clearance lights in the off position? I'm wondering if the PO may have replaced the toggle switch with an incorrect part.


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Old 04-21-2016, 09:58 AM   #6
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Marker or Clearance Lights

Rsponsford........ Yes, the ICC flash ought to be a momentary. If someone's been messing with the wiring you ought to also check the flash system for proper operation. The flash circuitry typically includes a couple of relays so that if you're running in daytime with running lights off, hitting the ICC will momentarily turn them on. But if you're driving with running/headlights on, hitting the ICC will momentarily turn them off.


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Old 04-21-2016, 10:06 AM   #7
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Thanks for the info! I've made sure I'm running with the lights on but I will replace the switch with a momentary switch. Thanks again!!!
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