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Old 08-22-2020, 09:19 PM   #1
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Exterior Light Issues


I have a 2015 Allegro Open Road 35QBA. When the lights are off and the brake pedal is pressed my FRONT PASSENGER PARKING LIGHTS and FRONT MIRROR MARKER LIGHT comes on. No clue why.
all other lights and flashers work correctly. Any ideas? Thank you
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Old 08-22-2020, 10:11 PM   #2
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When strange things happen with 12VDC circuits, it's usually a ground problem.

I'd start by making sure the lights that are acting up have good clean grounds. If that's not the problem, look for some common grounds between the 2 circuits.
Denny, Connie & Shadow (former barn cat made good)
2006 Tiffin Phaeton, Cat C7, Freightliner Chassis
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Old 08-22-2020, 10:31 PM   #3
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Are you sure it is the front parking light or could it be the turn signal light. I question this as I believe the Mirror marker light is tied to the turn signal as well as the rear turn signal light which I believe is common to the brake light system. If so it could likely be a diode problem between the brake lights and the right turn light. Good Luck that could be a bugger to diagnose
2000 Allegro Bus 35R 3126 Cat 300 Allison 3060MD 6 speed
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Old 08-24-2020, 02:07 AM   #4
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Turn signal switch can give this problem. Itís the only place both brakes and running lamps are common
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Old 08-24-2020, 11:30 PM   #5
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Thank you, its an easy place to start.
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