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1998.5 Cummins 24v Still Surging


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Ive Done the WT mod on my truck, replaced every battery cable and installed new terminals. Im still getting surging at 45-70 mph. How do I test the AC noise coming off my alternator? I believe the alternator could be the problem as its nearly 2 years old and Idk what the shop that installed it got it from. Ive also cleaned every ground i could find on it.  Is there anything else I should check?

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