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Been looking to see if these trucks have a air intake heater relay. I cannot find anything on the truck for a location of it or if it has one. It a roll back wrecker.
 

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Go to GMUPFITTER.COM and in the body builder manual there are electrical manuals for your year (what year is it?) and model. Download the manual. Then look for the part or circuit by using the find function of your PDF reader program.
 
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