Marker lights not working

Marker lights not working

Posted in the Isuzu NPR Forum

Ed T

United States

#1 Sep 21, 2010
I have a 99 GMC W4500 (Isuzu NPR) and my box clearance lights and Cab top lights don't work. They were spotty and now won't come on. Does anyone know if they run off a relay? I can make the box lights run fine with a jumper wire from another power source.
oscar

Los Angeles, CA

#2 Sep 30, 2010
Ed T wrote:
I have a 99 GMC W4500 (Isuzu NPR) and my box clearance lights and Cab top lights don't work. They were spotty and now won't come on. Does anyone know if they run off a relay? I can make the box lights run fine with a jumper wire from another power source.
your lucky i cant turn on my head lights because my marker lights go off but their is a relay box on the driver side behind the cab try theone furthest to the pasenger side it works for me.
Ed T

United States

#3 Sep 30, 2010
Ok I will check that out. In the mean time I sent power to the circuit by scotch locking the wire to the cab top lights to the wire from the front blinker running lights. Bingo! they work!

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