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2007 granite clearance light issues


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hey guys 

im a little new at the Mack game. So i have a 2007 Mack granite mixer truck that the clearance lights turn off after a couple minutes of running the truck. checked all the fuses and everything seems fine. another thing i noticed is when i hit the brakes the signal/marker lights on my rear fender light up. i repalced the headlight switch and the signal switch but still the same issue. Any help would be much appreciated 

thank you

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You have a short in your wires somewhere.   The reason they come on for a little bit is because your truck uses circuit breakers in the fuse panel, it take a minute to heat up and break the connection, which is when your lights go out.    Find the wire that’s causing the short and repair it.   Most commonly, shorted wires are traced back to owner added lighting such as fender lights for example 

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 Check all the lighting grounds also. A bad ground will cause feed back like you have with the brake lights.

"OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK"  Thomas Edison

 “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’

P.T.CHESHIRE

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