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Going crazy



Help !!!!

I have a problem with my 2001 Mack truck , i have checked all my wireing and they dont work , then it got warmer outside then they started working , all in the rear (brakes , running , left signal ) yes the right only worked im so lost , i checked everything now my heater is starting to go on and off too can anyone help me please , once it drops in temp my lights crap out

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Sounds like have grounding issue. Check your grounds and b.neg battery to frame conection.

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