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I've been noticing that while driving sometimes my gages just swap to the max, down to zero and then back to normal. I just changed my alternator because i had a bad regulator, but the problem continues to come back..not as often like before. Does anybody have the same problem or maybe a clue to what it can be or what i can check? Thank you
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Is anything resetting? Like your clock or your tripodometer (whatever its called)?
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Most cases I've heard of sweeping gauges suggest a charging system malfunction. So, you're on the right track.
Check to see if the battery cables are on the terminals tight and/or if there's any corrosion. If the shop replaced the alternator, make sure the cables/connectors are on nice and snug. Also, check electrical grounds too. Since the alternator went on you, it might be a sign your battery is dying (due to improper charging). Have your battery tested too.
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Also, check the length of cable from the alternator to the battery itself, and the main battery ground cable to the chassis for any cracks / breaks and corrosion as well. Faults with any of the major power delivery cables will cause you to have issues as you've discussed.
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