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Kreager

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    Manitoba

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    1998 Mack CL713

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  1. Well I found the short on the CB2 circuit. It was the radio. I unplugged it and now I have consistent power back, no resets, and the truck is running fine. I also cleaned the leads on the ground breaker. However, I have another problem. The alternator is charging very high, close to 16.5 volts. That is probably why the radio fried. Is there a voltage regulator on the CL713? I can’t find any info after a quick search online. Thank you for the bulletin. I’ll clean and check all grounds next weekend.
  2. Any update on what was causing your truck to have no power in the cab? I have a similar problem in my 1998 CL713 with the E7. Truck is new to me and I don’t know its history. It ran and drove fine the first time I moved it. I can crank the truck over and it will fire and run, but as soon as I release the key from start to run the engine immediately shuts down and there are simultaneous clicks from the dash fuse box, and then power is lost to everything. After approx 20 seconds or so power comes back. After multiple recycles and listens with a buddy, we’re narrowed the problem to the CB2 circuit. When I turn the ignition to run, the main relay in the fuse box clicks on and I get power in the cab. The voltage gauge hits 12, then jumps to 14 briefly, back down to 12 and up to 14 quickly before the CB2 finally clicks off and all power is lost until CB2 resets itself. I took out CB2 and put in a 20 amp fuse, repeated the process and fried the fuse (it’s not a bad CB). To me that seems like I have a short on the CB2 circuit but I don’t know what components are on that circuit, or where to start checking for shorts. Any help would be greatly appreciated. A wiring diagram would be extremely useful, but so would some advice. I promise to post a follow up if I have the issue resolved. Thx.
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