Q: its a dynasty 3.3. why doesn't the serpentine belt stay on on 1990 Dodge D250

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this last summer i bought my granddaughter a 1990 dodge dynasty. we've put on three serpentine belts on and they keep coming off. can someone help me? from lorraine.
crying in drayton nd
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i'm sorry, i guess i forgot to say we did that also. but thanks for a good answer.lorraine