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  1. Medium Duty Trucks
    I have a 2003 GMC C4500 Duramax originally owned & outfitted with a Link Mfg. UltraRide rear suspension system for Detergent TIDE's NACAR fleet. I bought it in 2007 at about 92K miles. It now has 113,000 and has developed issues. 1. The air tank was installed with moisture drain at ‘3 o’clock’...
  2. Electrical
    I found the wiring diagram here so figured It was a good place to come and ask too! I’m working on a 2007 C4500 with the LLY. The batteries keep draining over the weekend. I tested across fuses and found voltage between the hot on the courtesy fuse and ground of the gauges fuse. There is a...
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