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2000 Mack CL 700 dashboard gauges


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I am fairly new to this Mack. I could use some help. All the dashboard gauges are fluctuating erratically on my 2000 Mack CL 700 Elite. I am thinking its a bad cab ground. Can anybody tell me where the cab ground is on this truck ? Thanks John

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If it's anything like a rd or dm of that age it usually has a ground running from the battery to the starter and on from the starter to the frame , try grounding it straight to the frame from the battery and if that fixes it the cable from the starter to the frame is getting a bad connection or the cable is bad . We've seen this before on our trucks . Good luck

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