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I have a 1999 Kenworth t600. When I turn my low beam

Customer Question
headlights on , my low...
I have a 1999 Kenworth t600. When I turn my low beam headlights on , my low beam bbulbs are bright and my high beams come on dim. When I turn high beams on high beams come on and low beams get dim. Any ideas thanks brad
Submitted: 2 years ago.Category: Medium and Heavy Trucks
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Answered in 5 minutes by:
1/21/2016
Technician: Jeremy, Certified Truck/Bus Technician replied 2 years ago
Jeremy
Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3,774
Experience: ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician
Verified

My name is ***** ***** I will assist you.

You are describing a faulty multifunction switch. The switch is bad inside the turn signal stalk where the high beam switch is located.

Give it a swap and the issue should resolve.

How it should be is low beams stay the same and when you click the switch, high beams come on as well. Your switch is broken internally and crossing the light wires instead of changing them.

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Jeremy

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Customer reply replied 2 years ago
Already replaced it, still doesn't work. Also replaced wire harnesses from headlights to the plug behind the bumper
Technician: Jeremy, Certified Truck/Bus Technician replied 2 years ago

Well, the one thing I would have expected it for sure isn't it.

Hmmm...

There is a dimmer relay on the truck. That would be the only other thing that could cause that besides grounding/power issues in the harness in the cab.

If you add a ground to the circuit, there is no difference?

Click HERE for the diagram.

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Customer reply replied 2 years ago
Replaced the relay, also tried running another ground
Technician: Jeremy, Certified Truck/Bus Technician replied 2 years ago

Thee can only remain an issue in the harness in the cab then. Something is crossed and working right or the wrong lamps are used. There isn't anything else I can think of. I'm stuck without actually putting my hands on it...

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Customer reply replied 2 years ago
I tied clicking on your diagram but it did not work
Technician: Jeremy, Certified Truck/Bus Technician replied 2 years ago

I just checked it and it is working good. I had another check it and he had no issues either.

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Jeremy
Jeremy
Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3,774
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